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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> diesel engine to gas conversion with T-400 trans
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Topic Review (Newest First)
04-19-2009 09:17 PM
fast68 oh yes, but is just an FYI for anyone else out there though
04-19-2009 09:09 PM
RedBush1 i never ran it with the diesel converter. when i got the truck it ahd a wore out 454 with the diesel converter supposedly still bolted up to it. when i pulled it i yanked it and trashed it and got a 2000 stall and put in it
04-19-2009 09:06 PM
fast68 diesel lower stall speed is why i ditched the converter from my th350c that was behind a 350 oldsmobile diesel in the 81 pickup

in the trucks the switch is mounted to the pedal assembly under the dash since 1971

70 and older were carb linkage mounted

73-up style trucks:


74 camaro one:
04-19-2009 08:44 PM
RedBush1 i just bought a b&m 20248governor recal and a summit g110 adjustable modulator will that fix my problem
04-18-2009 07:46 AM
RedBush1 i already put a 2000 stall converter in when i put in the 383.
04-18-2009 07:04 AM
SSedan64
Quote:
Originally Posted by RedBush1
so do i just go to the parts store and get a goverenor for a truck with a gas motor and swap it out?
You can get them from a trans shop or order.
http://www.makcotransmissionparts.com/3L80-400hp.html

M&M's right about the Deisel torque converter. It will have a very low stall.
04-17-2009 06:36 PM
M&M CUSTOM I'm surprised no one has mentioned the lower stall speed of the diesel torque converter so far.

I have seen switches mounted both to the accelerator pedal assembly inside the vehicle and on the throttle linkage at the carb/TBI end too.
04-16-2009 04:04 PM
RedBush1 so do i just go to the parts store and get a goverenor for a truck with a gas motor and swap it out?
04-16-2009 06:57 AM
SSedan64
Quote:
Originally Posted by RedBush1
its like a 2inch round or so?
Yes, Sorry, I was thinking of a TH350 that has the clip holding the cover.
The 400 Gov cover has 4 bolts holding it on. Right/Passenger side rear of trans.
04-16-2009 05:59 AM
RedBush1 its like a 2inch round or so?
04-16-2009 03:31 AM
SSedan64 The Governor isn't in the ValveBody. It's behind the round cover w/clip on the outside, towards the rear of trans.
04-16-2009 12:38 AM
RedBush1 i already changed out the valve body with an aftermarket 1 bout 2 months ago. so that should have changed the diesel governor then right. so all i have to do now is the vaccum modulator and the electric kickdown correct. the valve body i put in it allows me to downshift at any speed but still maintain full automatic when in drive. i was thinking about going to a full manual if i cant figure it out. but dont really wanna go that route coz i dont plan on leaving that configuration for more than a few months until i got the money together to get all the parts to finish the 6cyl cummins diesel swap with a ford zf5 trans.
04-15-2009 10:04 PM
Crosley the t-400 trans was set up to shift early with the diesel engines... that would be the governor and valve body too.

a modified governor would help for later shifts and that vacuum modulator as mentioned
04-15-2009 02:06 PM
fast68 hi there,

when the electric kickdown solenoid is connected to a kickdown switch it will no longer shift so early

what year truck we talking here/

if old body style 91 or older then you could pull a stock switch from the accelerator pedal assembly of any th400 truck 73-up and run the single wire from it to the solenoid spade on the trans
and run power to the switch to the fuse panel ign source same as what factory did.

doing the same in a 78 right now converting from the original th350 to a nice 3L80HD from an '87

good luck
04-15-2009 10:51 AM
RedBush1 Thank you for the info. Hope it takes care of it can't wait to see how hard it'll shift when it works properly. I already replaced the valve body thinking that's was the problem. Just got in a hurry when I put the 383 in didn't realize it didn't have a kick down. Then when I was pulling out the stroker I was under it remover starter and headers I looked up at the modulater and it hit I bet it was never convetered from diesel to gas. Actually it was the header that hit but anyways thanks 4 the help.
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