SLINKYDOG

i just broke 4th gear this weekend at mid america motorplex. it was a AP2 trany which has the "better" secondary shaft and gear for lower gear ratio. i own also AP1 trany and was wondering if anybody has swapped out the secondary shaft and secondary gear set from one to another. i know the rear tailshaft housing/case is the same, but i do not know if the splines on the countershaft are the same or not for this to work,

note: i have seen aftermarket companys offer a secondary gear and not the shaft before, this is what makes me think the splines might be different?

speedengineer

In for any information on this. I was just thinking about this a couple weeks ago...looks like if I want to use my dyno reclass for NASA TTC, I will have to use an AP1 transmission.

I'm not very familiar with these transmissions, but is it possible to swap your AP1 4th gear (and 5th and 6th) into your AP2 transmission? If so, that would accomplish the same goal.

SLINKYDOG

well i just got the bearing and secondary gear pressed from the ap2 onto the ap1, i hope to get the trany back in soon and find out how it works, should be good to go.

speedengineer

Please let us know how it works for you. The 5th and 6th gear ratios should be much more useable now compared to the AP2 ratios! I swear my AP2 stops accelerating when I shift into 6th...

VitaRenovatio

Nice! I have heard of people putting in the AP2 secondary gear reduction in AP1 to get a better 5th and 6th gear ratio. 1st to 4th gear will be the same as before. I think this is a good mod for AP2 owners.

robrob

This is a sweet mod. Putting the AP2 secondary gear in an AP1 transmission will lower all 6 gears. This is a worthy mod for someone putting an AP2 motor in an AP1 chassis. Don't forget to swap the light AP1 flywheel onto the new AP2 motor though.

[edit: removed statement about AP2 motor and AP1 transmission being bad gearing match]

SLINKYDOG

its in and running and moving now. it works

note: i feel sorry for the guys that have to do the trany on the ground with out a hoist, because that clutch release arm is a P.I.T.A!!!!

note#2: since you have to press the bearing onto the clusther shaft, i just used the middle chassis boltthat is 14mmx1.5 as the bolt to use with a bunch of shims, hope this helps

CKit

Did you take any pictures perchance?

SLINKYDOG

sorry i did not even think about it.

how do you like the race trany you have?

JUSTINTHECOASTIE

Enlighten me please.