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  • 4T65E and 4T65E HD (99+) N-Body Swap

    So you have significantly modded your engine and now your transmission seems to be the weak link of your build. You have a few options to upgrade the stock 4T45E transmission which can be rather costly, or you can swap to the stronger 4T65E series transmission which seems to be uncharted territory for many. The purpose of this article is to provide a little more insight on what it will take to swap a 4T65E transmission into your 99+ N-body.


    Major Items Required:
    • 4T65E or 4T65E HD Transmission
    • Mounts (purchased or custom fabricated)
    • Torque Convertor (99-05 Grand Am GT)
    • Transmission dipstick Tube & Indicator (95+ Grand Prix)
    • Inspection Cover (95+ Grand Prix)
    • Gear Selector Lever (95+ Grand Prix)
    • Nose Cone Bracket (95+ Grand Prix)
    • Trans Cooler Lines (95+ Grand Prix)
    • Axles Pieces Sourced from Various Vehicles
    • Tuning Package (to reprogram PCM)


    Important Considerations When Picking your Transmission:
    • When picking your transmission you should look for a 98-02 transmission (See Appendix I).
    • The 4T65E transmission is more common and can be found with 3.29 drive ratio, which is preferred for this swap as it matches the stock gear ratio on the 99+ Grand Am GT model. This will be most likely the most affordable route and if desired the HD differential can be added.
    • The 4T65E HD transmissions can be somewhat harder to find and were only available with a 2.97 drive ratio. On the concept cars, GM engineers swapped out the internal input/ output gears 37/33 tooth for 35/35 tooth units. This change will raise the 4T65 HD 2.97 ratio to 3.29.

     
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    • 4 Speed Automatic Transaxle Info
      robertisaar
      The following pages contain information on specific transmission models from the 4T60, 4T60E and 4T65 family(4T40/4T45 and 4T80 information may be in the works, stay tuned). For now, it is NOT an all-inclusive list, but any missing information would be appreciated.

      Miscellania:

      4T60E Differentials with an asterisk are "fine pitch" final drives. Sun gears, internal ring gears, and pinion gears are NOT interchangeable with other final drives.

      4T65E with "IMS" have the newer type of shifter position sensor, called the "Internal Mode Switch", as opposed to the style found on 4T60E and early 4T65E transaxles.

      4T65E Stall Speed Info:

      these are approximate stall speeds based on the K-factor and TC size. YMMV, but they should give a good estimate as to which ones will stall higher or lower.

      245-115 = 1340
      245-163 = 1900
      245-177 = 2060
      245-180 = 2100

      258-115 = 1410
      258-133 = 1630
      258-155 = 1900
      258-164 = 2010
      258-179 = 2200

      4T80 General Info:

      Maximum Engine Torque: 300 Ft-Lb
      Maximum Gearbox Torque: 461 Ft-Lb
      Maximum Gross Vehicle Weight: 4750 Lb
      265mm Torque Converter
      269 Lb Dry
      295 Lb Wet
      15 Quart Capacity

      gearing:
      2.69
      1.626
      1.0
      .681

      39/39 Chain Ratio
      Differentials: 2.84, 3.11, 3.48, 3.71

      maximum shift speeds: 6400RPM

      All have a 39 tooth input speed reluctor?
      All have a 31 tooth output speed reluctor(VSS)?

      1995 G-Body(Aurora) 4T80E
      AKN 3.48:1 FDR (has higher shift points)
      ZYN 3.71:1 FDR

      1997-up
      G:
      MDN (has higher shift points)
      MSN

      1997-up
      E & K: AAN(has higher shift points)
      K: MLN


      1985 - 4T60
      Model Code Engine Platform Differential Ratio Sprocket Ratio Final Drive Ratio Converter Code Convertor Stall Speed
      CM, CP 2.8 V6 HO A-Body: Chevrolet, Pontiac, Oldsmobile, Buick 3.06 35/35 3.06 FD6B 2095
      CN, CW 2.8 V6 A-Body: Chevrolet, Pontiac, Oldsmobile, Buick 3.06 35/35 3.06 FD6B 2095
      HA, HJ, HT 2.8 V6 (Canada) A-Body: Chevrolet, Pontiac, Oldsmobile, Buick 3.06 35/35 3.06 FD6B 2095
      AF, AM, AY Cadillac 4.1 V8 Cadillac C-Body & Limo 3.33 37/33 2.97 FM8C 1525
      AR Cadillac 4.1 V8 Cadillac C-Body (Export) 3.33 37/33 2.97 FM8C 1525
      BS, BU, BN, BV Buick 3.0 V6 C-Body: Oldsmobile, Buick 3.06 35/35 3.06 FE4B 1865
      OB, OY Oldsmobile 4.3 V6 (Diesel) C-Body: Oldsmobile, Buick 3.06 35/35 3.06 FY7B 1525
      BA, BC, BR Buick 3.8 V6 A/C-Bodies: Chevrolet, Pontiac, Oldsmobile, Buick 2.84 35/35 2.84 FL4B 1895
      BX, BW Buick 3.8 V6 A/C-Bodies: Chevrolet, Pontiac, Oldsmobile, Buick 2.84 35/35 2.84 FM4B 1895

      1986 - 4T60
      Model Code Engine Platform Differential Ratio Sprocket Ratio Final Drive Ratio Converter Code Convertor Stall Speed
      CNH, CFH, CMH 2.8 V6 HO A-Body: Chevrolet, Pontiac, Oldsmobile, Buick 3.06 35/35 3.06 FD6B 2095
      HJH 2.8 V6 (Canada) A-Body: Chevrolet, Pontiac, Oldsmobile, Buick 3.06 35/35 3.06 FD6B 2095
      HBH 2.8 V6 (Venezuela) A-Body: Chevrolet, Pontiac, Oldsmobile, Buick, Cadillac 3.33 37/33 2.97 FD6B 2095
      BFH, BCH, BDH Buick 3.8 V6 (High Altitude) A-Body: Oldsmobile, Buick 2.84 35/35 2.84 FL4B 1895
      CTH 2.8 V6 HO (High Altitude) A-Body: Chevrolet, Pontiac, Oldsmobile, Buick, Cadillac 3.33 35/35 3.33 FD6B 2095
      BPH Buick 3.8 V6 (High Altitude) A/C-Bodies: Chevrolet, Pontiac, Oldsmobile, Buick 2.84 35/35 2.84 FL4B 1895
      BAH Buick 3.8 V6 C-Body: Chevrolet, Pontiac, Oldsmobile, Buick 2.84 35/35 2.84 FM4B 1895
      BLH Buick 3.8 V6 C-Body: Chevrolet, Pontiac, Oldsmobile, Buick 3.06 35/35 3.06 FL4B 1895
      BGH Buick 3.8 V6 (High Altitude) C-Body: Chevrolet, Pontiac, Oldsmobile, Buick 2.84 35/35 2.84 FL4B 1895
      ACH, AMH, AFH Cadiallac 4.1 V8 Cadillac C-Body 3.33 37/33 2.97 FM8C 1525
      AJH Cadiallac 4.1 V8 (High Altitude) Cadillac C-Body 3.33 37/33 2.97 FM8C 1525
      ARH, ADH Cadiallac 4.1 V8 C-Body (Export) 3.33 37/33 2.97 FM8C 1525
      BMH, BSH, BZH Buick 3.8 V6 E-Body: Oldsmobile, Buick 2.84 35/35 2.84 FL4B 1895
      BTH, BYH Buick 3.8 V6 E-Body: Oldsmobile, Buick 3.33 37/33 2974 FL4B 1895
      BQH Buick 3.8 V6 (High Altitude) E-Body: Oldsmobile, Buick 2.84 35/35 2.84 FL4B 1895
      AAH, ABH, AYH Cadillac 4.1 V8 Cadillac E/K-Bodies 3.33 37/33 2.97 FM8C 1525
      BBH Buick 3.8 V6 H-Body: Oldsmobile, Buick 3.06 37/33 2.73 FL4B 1895
      BCH, BDH Buick 3.8 V6 H-Body: Oldsmobile, Buick 2.84 375/35 2.84 FL4B 1895
      BHH Buick 3.8 V6 H-Body: Oldsmobile, Buick 3.06 35/35 3.06 FL4B 1895

      1987 - 4T60
      Model Code Engine Platform Differential Ratio Sprocket Ratio Final Drive Ratio Converter Code Convertor Stall Speed
      CAH 2.8 V6 HO A-Body 3.33 35/35 3.33 FD6B 2095
      CBH 2.8 V6 A-Body 3.33 35/35 3.33 FD6B 2095
      FCH, FLH Buick 3.8 V6 A-Body 2.84 35/35 2.84 FL4B 1895
      ACH Cadillac 4.1 V8 C-Body 3.33 35/35 3.33 FL8C 1525
      ADH, ARH Cadillac 4.1 V8 C-Body (Export) 3.33 37/33 2.97 FM8C 1525
      ALH, AFH Cadillac 4.1 V8 C-Body & C-Body Limo 3.33 37/33 2.97 FM8C 1525
      FTH Buick 3.8 V6 C-Body 3.33 37/33 2.97 FL4B 1895
      FNH Buick 3.8 V6 C/H-Bodies 2.84 37/33 2.53 FL4B 1895
      FBH, FKH Buick 3.8 V6 H-Body 3.06 37/33 2.73 FY4B 1895
      FSH Buick 3.8 V6 H-Body (Export) 2.84 35/35 2.84 FL4B 1895
      HAH Buick 3.8 V6 H-Body (Canada) 3.06 37/33 2.73 FY4B 1895
      HCH Buick 3.8 V6 H-Body (Canada) 3.33 37/33 2.97 FL4B 1895
      AHH Cadillac 4.1 V8 E/K-Bodies 3.33 37/33 2.97 FL8C 1525
      FRH Buick 3.8 V6 E-Body 3.33 37/33 2.97 FL4B 1895
      FZH Buick 3.8 V6 C-Body 2.84 35/35 2.84 FL4B 1895

      1988 - 4T60
      Model Code Engine Platform Differential Ratio Sprocket Ratio Final Drive Ratio Converter Code Convertor Stall Speed
      AAH Cadillac 4.1 V8 C-Body 3.33 37/33 2.97 FM8C 1525
      ABH Cadillac 4.1 V8 E/K-Bodies 3.33 37/33 2.97 FM8C 1525
      AFH Cadillac 4.1 V8 Limo 3.33 37/33 2.97 FM8C 1525
      ANH Cadillac 4.5 V8 C-Body (Export) 3.33 37/33 2.97 FM8C 1525
      ATH Cadillac 4.5 V8 E/K-Body (Export) 3.33 37/33 2.97 FM8C 1525
      BJH Buick 3800 V6 H-Body 3.33 37/33 2.97 FL4B 1895
      BKH Buick 3800 V6 C-Body 3.06 37/33 2.73 FY4B 1895
      BRH Buick 3800 V6 E-Body 3.33 37/33 2.97 FL4B 1895
      BTH Buick 3800 V6 C-Body 3.33 37/33 2.97 FL4B 1895
      BYH Buick 3800 V6 E-Body 2.84 35/35 2.84 FL4B 1895
      CFH, CMH, CRH, CWH, CXH 2.8 V6 A-Body 3.33 35/35 3.33 FD6B 2095
      CTH 2.8 V6 W-Body 3.33 35/35 3.33 FD6B 2095
      FBH Buick 3800 V6 H-Body 3.06 37/33 2.73 FY4B 1895
      FCH Buick 3800 V6 A-Body 2.84 35/35 2.84 FL4B 1895
      FJH Buick 3800 V6 H-Body 3.33 37/33 2.97 FL4B 1895
      FSH Buick 3800 V6 C/H-Bodies 2.84 35/35 2.84 FL4B 1895

      1989 - 4T60
      Model Code Engine Platform Differential Ratio Sprocket Ratio Final Drive Ratio Converter Code Convertor Stall Speed
      AAH, ANH Cadillac 4.5 V8 C-Body 3.33 37/33 2.97 FM8C 1825
      ABH, ATH Cadillac 4.5 V8 E/K-Bodies 3.33 37/33 2.97 FM8C 1825
      AFH Cadillac 4.5 V8 Limo 3.33 37/33 2.97 FM8C 1825
      AJH Cadillac 4.5 V8 E/K-Bodies 3.33 35/35 3.33 FM8C 1825
      BAH, BDH Buick 3300 V6 A-Bdoy 3.06 37/33 2.97 FY9B 1895
      BFH Buick 3300 V6 A-Bdoy 3.06 35/35 3.06 FL9B 1895
      10-08-2010, 02:48 PM
    • 4T65E and 4T65E HD (99+) N-Body Swap
      onefastV6
      So you have significantly modded your engine and now your transmission seems to be the weak link of your build. You have a few options to upgrade the stock 4T45E transmission which can be rather costly, or you can swap to the stronger 4T65E series transmission which seems to be uncharted territory for many. The purpose of this article is to provide a little more insight on what it will take to swap a 4T65E transmission into your 99+ N-body.
      ...
      09-20-2010, 09:36 PM
    • 4T4x-E Mechanical Specifications Information
      bszopi
      4T40-E/4T45-E Automatic Transaxle Unit Repair

      NOTE: Click on images to see a full-size view.

      Fastener Tightening Specifications




      End Play Specifications



      Reverse Clutch Backing Plate Specifications



      On-Vehicle


      Fastener Tightening Specifications



      General Specifications



      Range Reference



      Shift Solenoid Valve State and Gear Ratio



      Shift Speed



      Flex Plate A/T
      • Flywheel to Torque Converter - 46 ft.lb.
      • Engine Flywheel Bolt - 52 ft.lb.

      Fluid Pan A/T
      • Oil Pan to Case - 124 in.lb.
      • Bottom Pan
      ...
      08-18-2010, 09:25 PM
    • 4T65E Hardened 4th hub and solenoid upgrade
      Tbay99Venture
      INTRO
      This is a guide on how to service your transverse automatic transmission without a lift. All work is done with the vehicle on jack stands. Once the cover is removed the valve body is left attached to the channel plate. This assembly can then be moved to a workbench for easier servicing if valve body work is in your plans. In any case the transmission drive chain, pump, 4th gear assembly and many other parts can be repaired or upgraded at this time.

      In the description below the term "channel plate" is used, sometimes the term "case cover" is applied to the same part. The term "cover" applies to the large casting on the driver's side that seals the transmission and holds the engine mount bracket. The term "pan" applies to the oil pan on the bottom of the transmission.

      Parts on Hand:
      • Upgraded solenoids
      • ATF: 10 qts
      • Filter
      • Hard parts (4th hub, shift kit, accumulator upgrade, etc.)
      • Cotter pin (ball joint castle nut)
      • Transmission assembly gel or Vaseline
      • Seals: shaft and lathe cut driver's side case seal.


      Special Tools:
      • 33mm/34mm deep socket -- depends on your spindle nut
      • Engine support beam
      • Strong T-40 Torx(R) bit
      • Cold chisel
      • Heavy hammer/mini sledge
      • Small & medium pry bars
      • Large drift pin or scrap cylinder head bolt
      • Soft mallet
      • Scrap wire to suspend brake caliper



      PREP Use your 33mm or 34mm socket to break the spindle nut free on the driver's side wheel. Loosen & reset each lug nut so you can break them free easier once the vehicle is on jack stands. Remove the induction hoses and air filter from the engine to allow access to the wiring harness and allow clearance when the engine subframe is lowered. Disconnect the wiring harness from the transmission by pinching the round connector on each side and pulling back. Disconnect the shift cable by lifting it off the ball stud. Remove the thru bolts from the upper engine
      07-24-2010, 10:59 PM
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