North American Turbocoupe Organization

a4ld questions
J.C. Offline
Junior Member
Are the only differences between a a4ld trans from a 2.3 n/a and turbo the vacuum modulator and the valve body? Can the n/a valve body still be used if I remove 2 ball style check valves from it?

turbotbirdguy79 Offline
Senior Member
Im not sure but when my car had the crapriffic A4LD in it,I changed the modulater and it would never shift right.I thought it may have been the wrong one but I put many different ones from different stores and it never worked right again.I put the old on eback in and it shifted great.
1988 Tc,SC50(.63),Bosch BPV,Coolingmist methanol injection activated at 10 psi,FMS big valve 1.89/1.59 head,a234,ported E6,ported lower and upper intake,Gillis,3"downpipe,3"exaust,Kirbin AFPR,255 HP LPH pump,Racer Walsh adj cam pully 2* advanced*,K&N cone,MSD Blaster,autolite 103 plugs,T5 swap,3.73s,shifter,Centerforce stage 2 clutch,motorcraft tuneup.

J.C. Offline
Junior Member
I did a fair bit of research on this, and this is what I found out:

There are two main differences on the trannies.

one - valve bodies - the turbo version has 2 less check valve balls then the n/a one. Same valve body.

two - vacuum modulator - the one for the n/a will not work properly as it operates at different points and different pressures than the turbo model - hence you will have shifting problems - especially the 3-4 shifts.

Otherwise, they are the same.

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