Transmission swap: TH250 to TH350 Torque converter issues. - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-19-2008, 02:38 PM
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Transmission swap: TH250 to TH350 Torque converter issues.

More questions from a newbie!
My project is a 1935 Olds sedan that been sliced and diced with a 47 Ford PU to make a transport truck for my son's race go-kart. The donor power plant came from a 1984 Canadian Buick Regal (305 SBC with a TH250 tranny) I have rebuilt 305 SBC, added a 240H CompCam and 1980 Camaro diff. with a 2.56 ratio. I've dumped the 250 and installed a TH350 from a late 70's Chev wagon.
Here's my concern: The TH250 torque converter had female threaded studs to accept bolts attaching it to the flex plate whereas the TH350 has mounting brackets with open holes. It would appear the TH350 requires both bolts and nuts whereas the TH250 had bolts only.
I checked but unfortunately the TH250 torque converter will not interchange with the TH350.

Do I require special bolts and nut for this application or can I purchase bolts from the local hardware store?
Afterward do I secure with the bolts and nuts with Locktite?
Lastly: With the tranny attached to the engine, the TH350 torque converter is about 3/8s of an inch away from the flex-plate mounting brackets. Should I install spacers (washers) to fill the most of the gap between the torque converter and the flex-plate or do I draw the torque converter towards the flex-plate using the bolts without adding washers? To me it seem to be too big a distance for the converter to travel.
I look forward to you help.
Bj
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Old 05-20-2008, 04:53 AM
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Make sure you pick up grade 8 bolts and nuts. Fine threads also stay locked better.

As for spacers , it sounds like a good idea so the convertor can engage the pump "ears" more but I'm not 100% sure. I believe a 1/4" space is normal.
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Old 05-20-2008, 05:38 AM
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Thanks for the bolt tip. Does anyone else know about the spacing?
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Old 05-21-2008, 01:05 AM
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Spacing

Quote:
Originally Posted by 35oldstruck
Thanks for the bolt tip. Does anyone else know about the spacing?
You should have 1/8" (.125") to 3/16" (.1875") between the torque converter and flexplate before pulling the converter forward and bolting it to flexplate
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Old 05-21-2008, 03:25 PM
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Looks like spacing it is a good idea.
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Old 05-21-2008, 03:43 PM
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Thanks guys. Bolts and spacers are bought and ready to go in.
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