Anyone have a step by step how to modify a Governor on a th400 to hold first gear longer? Right now behind a small block chevy it will shift by its self at 5000, shift if firm, but than shifting from 2-3 you have to click the shifter at 6400 to have it shift at 6800. 4000 Stall jegs brand converter
Th400 Governor Mod
MassD
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I was just about to post a th400 governor thread. Oh well lots of good info in here.
chris718 can 700r governor weights be used on a th400. As i have some 700r bits lying around
At the moment my th400 box is a 74cj truck box. Rebuilt and tweaked a bit thanks to you guys, and the box has a lazy way to itself. Drives ok but shifts 2 early at part throttle and full throttle, and lazy will stay in 2ng gear down to like 10kph when coming to a intersection say, even with the adjustable modulator screwed in. Box is fitted behind a car now with ls1 3.45 diff and 3000rpm stall
Would a governor from a car that come with a th400 be a lot better to start of with/ work with ?
chris718 can 700r governor weights be used on a th400. As i have some 700r bits lying around
At the moment my th400 box is a 74cj truck box. Rebuilt and tweaked a bit thanks to you guys, and the box has a lazy way to itself. Drives ok but shifts 2 early at part throttle and full throttle, and lazy will stay in 2ng gear down to like 10kph when coming to a intersection say, even with the adjustable modulator screwed in. Box is fitted behind a car now with ls1 3.45 diff and 3000rpm stall
Would a governor from a car that come with a th400 be a lot better to start of with/ work with ?
The installation of the lite 700r4 weights is what I was referring to installing on the 400 governor body.Works great.
The SS454 trucks from the 90s used the lite 700R4 style primary weights to prevent stack shifting at low and medium throttle.The secondary weight was a thin square. Remember the primary weight is done influencing shift timing at around 30 to 35 mphour. The secondary weights are then in control as centrifugical force has acted on the primary weights holding them open against the stop due to their weight.
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2,731 Posts
Chris,
Can you explain how the springs influence shift timing? And, are there specific springs we should use?
Can these weights be duplicated using stock 400 parts?
I have experimented with different weight primary weights and haven't seen much difference with shift calibrations under 6000rpm; I am able to adjust shift rpm by varying spring pressure.
I have had good luck with what I do, but I am always looking for a better/easier way.
Thanks,
Jim
Thanks for the info Chris
Dam pain in the ass trial and error on the ground getting covered in oil whenever you open the governor cover lol
I know their is so many variables but wish there was a governor of the shelf bang just throw it in and you got say 5500 at least changes and it's not so lazy lol
Maybe I'm just dreaming
Dam pain in the ass trial and error on the ground getting covered in oil whenever you open the governor cover lol
I know their is so many variables but wish there was a governor of the shelf bang just throw it in and you got say 5500 at least changes and it's not so lazy lol
Maybe I'm just dreaming
install the 700r4 weights described on the 400 governor body with original 400 springs and you should be right between 52 and 5600. Then you can fine tune via the springs. You can use any combination of springs as well as delete one of them if necessary.The governor I mentioned is all I ever start with and will usually cover most applications up to 5800 rpms.
Found the 700r governor i had lying around in my garage and took some pictures of it may help other people also.
this governor is of either a 3.8 v6 buick powered rwd holden or 304ci v8 rwd holden (australian car) both cars come with a 700r here.
chris do the outside weights looks the same as the one you use? Inside it has 2 different size and colour springs as you can see by the pictures. Both weights look the same.
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this governor is of either a 3.8 v6 buick powered rwd holden or 304ci v8 rwd holden (australian car) both cars come with a 700r here.
chris do the outside weights looks the same as the one you use? Inside it has 2 different size and colour springs as you can see by the pictures. Both weights look the same.
That governor has the correct outer weights I spoke of but not the inner. The outer weights, if installed on the 400 frame, will result in later low/lite throttle upshifts but will not affect wot. You will need lighter secondary weights to raise wot upshifts but if you want to stop stack shifting downstairs that is the fix. Also if the inner weights on the 700 are lighter than what is on the 400, it will give later wot upshift. Just remember , do not use the 700 springs. Rate is much higher and will fight with the weight mods.Found the 700r governor i had lying around in my garage and took some pictures of it may help other people also.
this governor is of either a 3.8 v6 buick powered rwd holden or 304ci v8 rwd holden (australian car) both cars come with a 700r here.
chris do the outside weights looks the same as the one you use? Inside it has 2 different size and colour springs as you can see by the pictures. Both weights look the same.
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Thanks heaps for the info chris 
Il try and look at it over the next week or 2 chris and tell you how i go.
Il weigh the inner weights on my 400 governor and the 700 governor also.
Will weigh the outer weights and change also as the 1-2 and 2-3 change i want to raise by around say 4-5mph on each gear as it shifts way 2 early at light throttle now.
Will the outer weights also make it change down a little earlier as now when you slowing down say for a give way sign , corner etc it wont change back to 1st gear in drive untill your like say below 6mph or so
Il try and look at it over the next week or 2 chris and tell you how i go.
Il weigh the inner weights on my 400 governor and the 700 governor also.
Will weigh the outer weights and change also as the 1-2 and 2-3 change i want to raise by around say 4-5mph on each gear as it shifts way 2 early at light throttle now.
Will the outer weights also make it change down a little earlier as now when you slowing down say for a give way sign , corner etc it wont change back to 1st gear in drive untill your like say below 6mph or so
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3,227 Posts
Removing the MTV spring from the valve body will raise your minimum throttle up shifts..... desirable in vehicles with higher numerical ring pinions.
4000 lb Belair, 409 cu, Th400, 4:56 gears, 31.5" tires, 3,000 stall. This governor will make auto shifts at 5800-6000 in Drive. I used a digital scale in grams. Grind as necessary. Use a finishing nail for the hinge and smash the end to lock it.
Top piece 16.4g
Outer weights 30.1g ea.
Inner weights 9.8g ea.
Body 118.9g
Piston 23.4g
Spring #1 depressed half way on the scale is 4000g
Spriing #2 depressed half way on teh scale is 155g
Top piece 16.4g
Outer weights 30.1g ea.
Inner weights 9.8g ea.
Body 118.9g
Piston 23.4g
Spring #1 depressed half way on the scale is 4000g
Spriing #2 depressed half way on teh scale is 155g
400, 350, 700 use the same governor. This should be pretty close. Skeleton Governor used in 350 IROC Camaros.
Drop it in the hole and go. That's a seriously good price.
http://www.ebay.com/itm/TH700R4-Aut...overnor-Chevy-S10-S15-Camaro-Firebird-/400913538202?hash=item5d584f1c9a&vxp=mtr
Drop it in the hole and go. That's a seriously good price.
http://www.ebay.com/itm/TH700R4-Aut...overnor-Chevy-S10-S15-Camaro-Firebird-/400913538202?hash=item5d584f1c9a&vxp=mtr
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