4L60E Transmission Modifications

[RedHeartbeat]

This is a common question on the board so here is a link to Hit Man X's post over on GMFullsize

http://www.gmfullsize.com/forum/showpost.p...mp;postcount=40

As mentioned in the post, pay particular attention to clearances and backlash.

The Electronic Pressure Control to vacuum modulator control device is Transgo kit 46MOD available from Oregon Performance Transmission or TransmissionCenter.net.

The most common shift kit is the Transgo 4L60E-HD2 model though they do sell a simple shift correction kit.

The Raybestos Blue Plate Special 3-4 clutch pack comes with instructions to drill a #58 hole to vent residual oil out of the input drum housing, from behind the piston that actuates the 3-4 clutch pack.
http://i47.photobucket.com/albums/f197/red...t/5-31-2007.jpg

Feel free to add to this post any good information or part numbers.


Good items to have for a stock+ rebuild...

Transtar PNs...

Transgo 4L60E-HD2 kit
Corvette 1-2 and 4th servos if stock converter and billet servos if 3000+ rpm stall converter
Aluminum forward accumulator piston
Aluminum 1-2 and 3-4 accumulator pistons
Complete gasket/seal kit for appropriate year model transmission
new transmission filter. Make sure to measure the depth of your pan to get the correct one.
three bonded piston seals
New valve body spacer plate
"Beast" sunshell
if 2nd gear was slipping get a new or rebuilt reverse drum
New Borg/Warner clutches and band
New steels

Here's what I'll order for someone that already has the shift kit and Corvette servos...
Master kit 4L60E (W/ PISTONS) DEEP PAN............................................... ................ 97-03........ 74008EC
includes clutches, steels, filter, gasket and seal kit, metal clad seals and 2nd band
Reverse Input Drum (No Check Ball) (Large Feed Hole)............................................. .. 3/87-Up..... 74556B
Plate, Valve Body To Case Separator, 4L60E (Transgo)......................................... ....... 96-05...... 74747EC
Piston, Forward Clutch Accum, 4L60E (in Valve Body) Aluminum...................................... 1 93-Up... 74741G
Kit, 1-2 & 3-4 Accumulator Piston (.310” Pin Dia) (Pinless Design)............................ 1 82-Up.......... 74927K
Shell, Reaction Sun (The Beast) (incl. Special 4 Tang Washer).................................... 1 82-Up...... 74624A

[Hit Man X]

This is interesting on 3-4 packs

http://www.specialtytrans.com/specialty/700-3-4.htm

[RedHeartbeat]

The last update on that was May 30, 2001. I wonder if that is still how they do it.

[Hit Man X]

I'm tryin to see how feasible it will be to modify an input drum to accept TH400 direct clutches.

From my Alto book, it shows that the 80E clutch is 0.151" larger in OD than the 60E one. ~5/32" only. From the pictures I've seen of built input drums it looks like there is enough room to machine out the drum slightly for this larger clutch.

5.893 - clutch; 4.575 - steel. 80E
5.742 - clutch; 4.995 - steel. 60E

[RedHeartbeat]

Check the internet, I saw somewhere a company was building larger diameter 3-4 input drums. It may have been simply machining them larger but I read about it on the internet somewhere.

[Hit Man X]

Hrm, I'll look around. Let me know if you come up with anythin... I'm going to see how far I can take a 60E



www.api-racing.com apparently they can do it. I'll email today. They do, $600 to hold eight TH400 clutches.

[ORNGENV]

which 4th servo is better sonnax or superior

[ducky]

I've heard alot about superior and how well they work.

[geestyle]

you cant shift into od at wot with a aftermarket 4 gear servo

[ORNGENV]

so will the truck just stay in 3rd until i get out of WOT