Question : 3400 to 3100 Trans?

[ItsVince725]

Will a 3400 bolt up to a 3100's 4T60 transmission, or would I require a 3400 4T60's bellhousing?

Also, how much power can a 4T60 take?

[Superdave]

It'll bolt right up, no problems at all.


Not sure on the power handling if the 4T60 though.

[Z26-T]

Depends on how much power, how long since it had been rebuilt, and what it was/is rebuilt with. If it's the factory 1995 4t60e that's in your car, the 3400 will make it wear out more quickly. Though I wouldn't worry too much about having it "built" if you don't plan on doing much more than a stock 3400.

There is a member on here that is running a built 3400/3500 hybrid with NOS and his 4T60e is holding up well. However, he did build his 4t60e to hold the power. There was another member that had a built 3400/3500 hybrid with a turbo who blew up 3? transmissions in less than a year. But they were used transmissions.

[ItsVince725]

So there are parts to build up these transmissions to handle more power?

I plan on turbocharging the 3400 I swap into this car and I most definitely don't want transmissions grenading. A blown transmission is what killed my first car.

[3400-95-Modified]

This is a quick run down of whats been done to my trans and what Parts I've purchased... Get an ATSG rebuild book too.

Valves: Purchased from http://www.transmissionpartsusa.com
84754-22k Torque converter clutch apply valve kit (standard size) 91-96
84754-23K Anti-stick 1-2 shift valve
84754-25K hi-ratio Reverse & modulated line boost kit
84754-36k 2-3 Shift Valve 94-97
84754-37k 3-2 Downshift valve 91-up
84754-38k 3-4 Shift valve 91-up
84754-39k 4-3 Downshift valve 91-up

Hard Parts: Purchased from http://www.bulkpart.com
A84570B 4th Clutch hub & Shaft (No bearing at clutch hub end/Sleeve race at splined end) 96-99
A84624 Shell, Reverse Reaction, Black Hardened

Clutches: Purchased from http://www.level10.com (I recommend http://www.wittrans.com for others, MUCH cheaper)
84119EAS1 (wittrans number) Friction Module Stage 1 95-up (Raybestos Part #RCPS-32)

Alto Powerpacks: Purchase from any Alto distributor.
062756HP 2nd Clutch PowerPackŪ Red 83-On 1 Hi-Performance
062758HP 4th Clutch PowerPackŪ - 4T60 Red 83-93 1 Bent Tooth Frict - Hi Perf
062758AHP 4th Clutch PowerPackŪ - 4T60E, F7 Red 87-93 1 Bent Tooth Frict - Hi Perf
062758BHP 4th Clutch PowerPackŪ - 4T60E Red 92-98 1 Bent Tooth Frict - Hi Perf

Steels: Can be purchased from http://www.wittrans.com (I got mine from level10 after complaining)
84139EA Steel Module, L94-UP

Kits: Purchased from http://www.transmissionpartsusa.com
37936 4t60e Transmission Shift Kit, 1991-1999 (Shift Improver/correction kit, NOT PERFORMANCE)

Rebuild kit: Mine came with level10 Kit, I recommend this for others http://www.transmissionpartsusa.com Or second FULL kit from http://www.northernautoparts.com
37023 Transmission soft Overhaul kit 91-99 (No bonded Pistons, No steels, No fibers) Soft kit, Gaskets, o-rings, sealing rings.
84008EA TranStar Deluxe Rebuild kit (includes Pistons, steels, fibers, front band, and filter)

Bands: Can be purchased at http://www.Bulkpart.com
A84026A 1st & 2nd (Center Band) 1-2 Coast 91-up
B84022E FWD (Rear band) 91-up
B84024A Reverse (Front Band) 91-up

Bushing Kit: Can be purchased at http://www.Bulkpart.com
84030E Bushing Kit 91-up

Thrust washer kit and Misc items: Purchased from http://www.transmissionpartsusa.com
37670A 4t60e Thrust Washer kit 93-up
84532-01k Differential Lube Tube Retainer
84881 Solid pump slide pivot Pin (pack of 5)
4662 Transmission Pump vane (9 needed)
37954 3rd Clutch Bonded Rubber Piston 91-99 (If needed)
37953 2nd clutch Bonded Rubber Piston 91-99 (I would suggest replacing during rebuild)
37888 4t60e Dual red strip vacuum Modulator 83-99 (Universal Adjustable type)

Sprags: MUST REPLACE STOCK on 95-older http://www.bulkpart.com
A44654 1991-1995 1-2 Roller (springs rub inner race and burn out causing failure.)
A84652A 1-2 Roller 1996-up (Factory one typically lasts just fine.)

Now everything that has been done to my trans has been done in an odd fashion

I first purchased a Deluxe rebuild kit from Northern Auto which included all the bonded pistons for the apply clutches, two bands, and more, Part Number #84008EA The piston are not always needed since they don't wear out that often and most of the apply pistons have lip seals which come in the soft kit. Also when I purchased this full kit it contained the full bushing kit so I did not have to purchase this separate, I listed all the items separate above because if you buy a full kit you waste money on a set of clutches you won't use. I didn't do the math, but if you get a full kit that comes with steels and bushings pistons, and bands (if noted) then you may save some money over buying all individual. I only recently did the Stage 1 kit from Level 10 where I'm replacing all the clutches and steels, and also putting in all new seals since I'm in there, I'm leaving the bushings alone since they look just fine.

My trans now has Alto Red Eagle high performance power pack clutches in the 2nd pack and the 4th pack, and I also now have a RevMax torque converter.

It will also chirp second gear because of what I've done to it... I have yet to break anything in it and the day I do I will be converting to a 4t65e.

[ItsVince725]

Wow, that's a LOT of parts.

Pretty much replacing half the transmission...

[3400-95-Modified]

Wear items yes... I did replace near everything... I didn't want it to break and being able to put down 12's in the 1/4 at 107mph makes it all worth it.

[ItsVince725]

Well it's probably cheaper than a whole new transmission...

But you can't order this stuff all in one enormous box?

[3400-95-Modified]

I was not able to find one person who supplys all of this stuff... plus that list contains some things you may not need... its a list of everything that I've done to the trans since I started moding this one so some things did replace other mods.

Basic things needed is the valves for the valve body if its an older year, the Transgo shiftkit, and then reputible clutches and the other hard parts I listed, the sprag and 4th hub and reverse shell... You probably dont have to do the bushings. Most you will figure out when you take it apart.