Malibu310

Has anyone updated an early Automatic to a later series 4 speed... was it simple or complex? What parts were needed?

Rick H

G Man

If it were me I would stick with the three sp trans. I have an 84' with the 4 sp and really don't like the way it works compared to the three sp that was in my 81'. Good luck with the project if you go for it.

atb

When (if) I get the stroker motor done, I'll be seriously considering a 3 speed A/T retrograde in my S4. What am I going to need first gear for anyway? Wonder if I could keep the 2.20 diff?

sublimate

Add a GearVendor and your 3spd becomes a 6spd.

pvoth

I like my 3spd tranny.....with a little tweaking it shifts awsome
65 mph in 1st gear and then bam 2nd and it just gets bettter

Malibu310

We blew out two of the three speed transaxles with our 600HP and 600 lbs torque - I was told the 4 speed transaxles as odd as they are with 1st gear are much stronger.

atb

Good to know.
Guess I may be holding onto the stock 4 speed.

rhys

Following the dictate that the only stupid question is one you don't ask, what is a GearVendor?

rhys

A further dictate is not to ask a question for which there is an answer available through "search"! Found it... thanks anyway.

Vilhuer

IIRR '87 and younger 4sp box do not fit into older body without some mods to body on torque converter area.

C.F.

This is what I have heard , a VERY large hammer apparently performs the required mods just be prepared to do some trial fitting.

Rob M Budd

Tell me about the "tweaking". My 80 3 speed takes forever to shift at WOT. It "hangs" between gears for almost a full second.
With the Vacuum Modulator connected. it hangs at WOT and part throttle.
With the VM disconnected, it shifts fast at part throttle, but hangs at WOT.
Adjustment of the VM seems to affect at which RPM it shifts, but not the time it takes to shift.

928FIXER

I updated my 79 to a 4speed.Easy to do and I don't remember having to hit anything with a hammer and the 79 has the large battery box.It will make a huge difference in your 0 to 30 time.You will like it.

Stan.Shaw@Excell.Net

I have a core torque tube and core transmission available from an '86.5....

Rob M Budd

I'll take them if you can you put them in the box with the pod.