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#1
11-13-2007, 09:49 AM
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Transmission TH350 - TH400
In our 71' Chevy truck 350ci, we replaced the tranny -TH350 (Mechanical) with a newer TH400 (Electronic). The truck shifts late into second when the engine is running high RPM's and it has a hard time shifting in 3rd. The TH400 tranny ran fine before installing. Is there something needed to convert this electronic tranny to run smooth? We also need to change the gear for the speedometer cable, how is this determined?
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#3
11-30-2007, 08:06 PM
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Re: Transmission TH350 - TH400
The 'electronic TH400' is actually called a 4L80E, has overdrive and requires a computer. If this is the transmission you have, and you don't have that computer, this is what will happen.
All TH400 transmissions have electric kickdown. The later variants of the TH400, officially renamed 3L80, don't have lockup converters or anything, so there should be nothing else electrical aside from the single conductor kickdown line.
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1988 9C1 - Modified LM1 @ 275HP/350TQ - TH700R4 - 3.08 8.5" Disc Rear - see it at http://www.silicon212.org/9c1! 2005 Crown Vic P71 - former AZ DPS - 4.6 liters of pure creamy slothness! 1967 El Camino L79/M20 old school asphalt raper Remember - a government that is strong enough to give you everything you need, is also strong enough to take everything you have.
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