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10-19-2005, 08:35 AM
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#1 |
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Registered User
Join Date: Nov 2004
Location: hays, kansas
Posts: 20
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th400 shifts fast
I just finished changing the 700R4 to a th400 in my 85 blazer. When I went out for the test drive it shifted through all of the gears very fast (by 30mph). The truck then lugs up to speed. Any ideas on what could cause this?
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1969 Chevy LWB 350, vortec heads, pro perf intake & powerglide 1985 Chevy K5 Blazer 1951 Buick 2 door HT; 350/350 combo, sub frame, disc brakes |
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10-19-2005, 11:19 AM
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#2 |
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Professional Grade
Join Date: May 2003
Location: Fort McMurray, Alberta
Posts: 7,915
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Re: th400 shifts fast
Vaccum modulator probally needs to be backed off 1/4 to 1/2 a turn
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1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap) |
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10-19-2005, 11:20 AM
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#3 |
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user # 2756
 
Join Date: Jun 2001
Location: Chesapeake, Virginia
Posts: 4,612
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Re: th400 shifts fast
Or replaced, but adjust it first.
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm 
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10-19-2005, 11:22 AM
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#4 |
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Registered User
Join Date: Nov 2004
Location: hays, kansas
Posts: 20
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Re: th400 shifts fast
How do I go about adjusting this?
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1969 Chevy LWB 350, vortec heads, pro perf intake & powerglide 1985 Chevy K5 Blazer 1951 Buick 2 door HT; 350/350 combo, sub frame, disc brakes |
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10-19-2005, 04:14 PM
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#5 |
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Professional Grade
Join Date: May 2003
Location: Fort McMurray, Alberta
Posts: 7,915
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Re: th400 shifts fast
Take the vac line off and look in the hole. If it is an adjustable one, you'll see a notch you can turn with a small flat headed screwdriver.
If it isn't adjustable, then you'll need to replace the whole thing.
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1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap) |
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10-23-2005, 10:52 AM
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#6 |
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Registered User
Join Date: Oct 2005
Location: Warner Robins, Georgia
Posts: 34
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Re: th400 shifts fast
what are you gonna do with your 700r4?
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10-23-2005, 05:45 PM
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#7 |
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Registered User
Join Date: Dec 2003
Location: here
Posts: 5,789
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Re: th400 shifts fast
Ive seen some that you adjust with a small allen wrench too...
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