ok i had my t-5 rebuilt about 9000 miles ago and it works fine except under spirited driving conditions when it will grind on the 1-2 and 2-3 shift mainly the 2-3 shift, also i have a Hurst billet plus shifter with the adjustable stops, is it possible i could be shifting too fast and not letting the synchros line up before letting the clutch out? it doesnt do it all the time only when i hammer on it and run it to 5k and slam it into gear.

now maybe i am just asking too much from this trans but i dont remember it doing this before.
so i just wanted to get some opinions , and also what kind of intervals do u guys change ur trans fluid on? for extreme driving conditions, I have some Mobil 1 synthetic ATF i am gonna put in soon, BTW my trans uses ATF not gear oil.

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87 IROC-z 305 TPI
Borg Warner T-5 fresh rebuild
10-bolt 3.73 Richmond gears rebuilt GM posi,
Ported Plenum and Runners Homemade AFPR
ACCEL 8.8 wires, High output coil,and cap & rotor
Bosch platinum + 4 plugs
Ram Air w/ K&N filters,
MAF sensor screens removed, TB coolant bypass
Polyurethane tranny and torque arm mounts
Dynomax catback w/custom tips
K&N oil filter,Mobil 1 synth, Futura GLS Super Sport tires 265/50/15 rear and 235/60/15 front mounted on 86 monte carlo SS rims ,

400 sbc and a 6 spd in the works

 

btt

 

My transmission doesn't do that, and I just had it rebuilt about 300 miles ago. It's suppossedly a WC T5 in my car, but I couldn't tell you. Try conventional ATF instead of the synthetic. I have heard of problems with the synthetic not allowing the syncros to line up the gears correctly.

Now if the new clutch were just worth a poop everything would be great. Just out of curiousity, how much did you spend on the rebuild. I spent $1200 on a new clutch set and rebuilt tranny. This included removal and installation. Now I have to redo the hydraulic clutch setup because they didn't look it over when it was all apart.

Sean
1991 B4C Camaro

 

I wouldn't drain the syn. lube out. What kind of grinding?

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1991 Firebird
350 L98 (was a 305 TBI),T-5,Edelbrock TES and cat back,Accel manifold
NOS,subframes,jegster torque arm,MSD Digital 6
AFPR,Lakewood lcas
Hurst linelock,SLP cam (206 212 .480 .486),relocated battery,cold air,Hypertech chip,centerforce df,clutch
poly bushings and mounts
AFR 190s
Harland sharp 1.5 rockers
autopower rollbar

12.33 @ 114.83 juiced uncorrected

13.510 @ 102 non juiced uncorrected