Question about Swappable Auto Trans

[1988GTU]

since the 94-up 3100 L's had 4T60Es, wouldn't that allow for nearly a direct swap if you use one of those?

the 60E is beefier than a 4T40/4T45, so that's clearly not the reason, and unless you grab a HD 4T65, the strength difference there is slight.

Not a direct swap. A 65e is best to start with than a 60 by far so if u ever needed to improve the trans to handle more power, the upgrade would be mindless work. The 45e is in my opinion, just as capable in handling power as the 60. The 45e shares 80e characteristics and is a very cheap alternative for a trans swap when ditching the three speed.

[robertisaar]

grabbed this from the TGPforums since it came up recently....

|--------Maximum-------|
                          Engine      Gearbox   Gross         Torque     
Trans           Weight    Torque      Torque    Veh. Wt.     Conv. Dia.  
   Model        (lbs.)    (lb/ft)     (lb/ft)     (lbs)       (inches)              


3T40              161       200        416        5100      9.64
4T60              195       235        369        5181      9.64
4T60-E            203       280        390        6400      9.64
4T65-E            214       285        400        6400      9.64/10.16
4T80-E            295       305        461        6800      10.43

from the looks of it, these numbers were generated by taking the most powerful engine they were attached to and referencing the highest GVWR as well.

no idea about the 3T40, but the 4T60 looks like it was based off of a TGP(maybe a 4.9 caddy?), the 4T60E is refering to the 1996 model that was attached to a L67, the 65E also looks like L67, and the 80E is obviously a N*.

now, the 4T40s biggest torque load was 190 lb/ft, and the 4T45 saw 205 lb/ft, with i think 4000 and 4500 lb GVWR respectively.

i don't see what's so great about the 4T4x series.

[1988GTU]

grabbed this from the TGPforums since it came up recently....

|--------Maximum-------|
                          Engine      Gearbox   Gross         Torque     
Trans           Weight    Torque      Torque    Veh. Wt.     Conv. Dia.  
   Model        (lbs.)    (lb/ft)     (lb/ft)     (lbs)       (inches)              


3T40              161       200        416        5100      9.64
4T60              195       235        369        5181      9.64
4T60-E            203       280        390        6400      9.64
4T65-E            214       285        400        6400      9.64/10.16
4T80-E            295       305        461        6800      10.43

from the looks of it, these numbers were generated by taking the most powerful engine they were attached to and referencing the highest GVWR as well.

no idea about the 3T40, but the 4T60 looks like it was based off of a TGP(maybe a 4.9 caddy?), the 4T60E is refering to the 1996 model that was attached to a L67, the 65E also looks like L67, and the 80E is obviously a N*.

now, the 4T40s biggest torque load was 190 lb/ft, and the 4T45 saw 205 lb/ft, with i think 4000 and 4500 lb GVWR respectively.

i don't see what's so great about the 4T4x series.

Where do you see the 45E information?

[robertisaar]

i grabbed the 40/45E info from wikipedia, and although we know it's not a 100% accurate source, i personally can't think of any 4T4x applications that exceed the stated values.

[1988GTU]

Jeff at EP supposedly had a 45e take 350whp with no problems. Whether it was his or a customers trans I don't have that information to add. He didn't make it an extreme build either from my understandings.

[robertisaar]

i'm not saying it can't be done, but as per the vehicles/engines they were attached to from the factory, the 60E was hooked up to much more demanding applications than a 4T4x ever was. even the official naming of the transaxles implies that a 60E in an otherwise identical situation that it should withstand more abuse.

[bszopi]

Here is a 400WHP one... http://grandamgt.com/forum/showthread.php?t=85507 Not sure what all was done to the tranny.

[1988GTU]

Here is a 400WHP one... http://grandamgt.com/forum/showthread.php?t=85507 Not sure what all was done to the tranny.

It doesn't clarify if it really is what some other member mentioned it was. What is it, and who built it?