4t60 vs 3t40 VS 4t65

TurboGTU · March 04, 2010, 07:06:18 PM

Been away for a while now, but I'd have to dig up alll my notes which I don't know where they are at. Pontiac Jeff from 60degreev6 can help you out there. Hes a wizard at this frankengoat stuff. I still have mine apart. But do know if you get a 65hd core, try to get a 01 and up. THey had the better guts you need. You need the 2nd clutch drum, reaction drum, Planets, Diode sprag, intermediate shaft and some other things I cant think right now of.

For what its worth, the 3t40 if built to quad 4 specs can last on stock TGP levels.

TGed · March 04, 2010, 08:08:26 PM

I use a 3t40, will know the results once I can get around to tuning.

DefEddie · March 08, 2010, 03:14:59 PM

Well,engine and trans will be in a fiero and not a tgp.
I've already got a 3 speed auto,and looking forward to the overdrive as this is my daily driver.
I will miss the low gearing,but the tgp trans is a lower final drive I think so shouldn't be terrible.

TGed · March 12, 2010, 11:33:26 PM

Quote from: DefEddie on March 08, 2010, 03:14:59 PM
Well,engine and trans will be in a fiero and not a tgp.
I've already got a 3 speed auto,and looking forward to the overdrive as this is my daily driver.
I will miss the low gearing,but the tgp trans is a lower final drive I think so shouldn't be terrible.

I don't have my 3t40 in a GP either.... Went with a slightly lighter platform and less rarity factor of a vehicle choice.

TurboGTU · May 06, 2013, 12:44:54 PM

Digging this out of the grave :icon_rolleyes: . Mostly do to a new aftermarket part being made.
http://www.sonnax.com/system/announcement/84965-01K.pdf . 3rd clutch piston with 50% more clamping force. On the 4t60 this will allow more clutch space too. Was meant for the bonded small piston setup on the E transmissions. I haven't got a price for it. One source I found said expect 150 range.

Also those looking into the 4t60/65 h6brid need to use the sprocket support from the 65e but turned down on the driven sprocket end about 3 mm on a lathe. Measure first. The 4th piston needs some grinding down on the apply surface as of sits too high in the 65 sprocket support. I haven't found a solution for the 440t4 that have a Lupe hole on the side to use the 65e guts. I'd say update to a whole 4t60e/65 hybrid or go all out 4t65e ,HD. The 60e can use the 65hd differential. O

GPChief · May 06, 2013, 02:48:47 PM

Does the 65hd differential bolt in or do you need the whole housing?

TurboGTU · May 06, 2013, 10:35:16 PM

For the 3.29 regular 65e yes but need the diff ring gear housing but cut down shorter like the 4t60. I wouldn't bother with it as the 4t60 3.33 is plenty good. The 65-HD diff doesnt fit. Its wider and taller while using a roller bearing on theouter passenger side . If your set on the HD diff you need to use a 4t60e with something to shift it or use a trans controller setup with a whole 65e. The 60e is easier as it uses a vacume modulator and only need to activate the shift solenoids. You need the 91-96 w-body 4t60e CV axles as spine count is different . I need to verify first. 65 is suppose to be the same as the 4t60 spine count but need the pass side CV axle anyway from a w-body 65e

TurboGTU · May 07, 2013, 03:23:03 PM

Up to 1996 w-body driver side 4t60e same as TGP driver side. PAss side 4t60e axle shorter need that axle. 4t65 need both cv axles.

GPChief · May 07, 2013, 03:45:53 PM

Thanks, seem like a little more trouble than its worth.

TurboGTU · May 07, 2013, 05:22:28 PM

Just a tad ;) .

I'm building a 60e/65-hd hybrid for the Beretta. I was able to assym it using the 60e driven support on the 65 guts. Something is off on that 4t60 I have . 6mm seems a bit off. Wasn't the 3 mm I quoted.