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08-31-2013 #1
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- Join Date
- Sep 2009
- Location
- Charleston, SC
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- 140
TH350 premature upshift from 1st to 2nd gear
My 78 firebird has a mild built 355sbc and TH350 trans. The trans was rebuilt and I used a mild B&M converter and it has a B&M shift kit. The problem is that the trans will upshift very early from 1st to 2nd gear, even if I am at full throttle. It doesn't slip and if i put the gear shifter into L it will launch and accelerate in 1st gear with no problems.
Any suggestions of what to look for? My first thought was the modulator although it worked fine before the rebuild.
89 Supercharged Saleen 352 rwhp, 93 Mustang LX 347 stroker 420 rwhp daily driver, 78 Firebird, 69 Opel Kadett Rallye ex-SCCA track car..."everyone needs to own a 4-bbl 4 cylinder once"
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08-31-2013 #2
Registered User
- Join Date
- Nov 2006
- Posts
- 201
I would look at the modulator adjustment or the spring / weight combination in the governor. The lighter the springs the later the shifts in the governor. I hope this helps.
Thanks,
Mark
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