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Old 11-14-2006, 09:30 PM
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Question about the oil pump on a TH250

My torque converter, or oil pump just crapped out on me last weekend.
I have the old TH250 in the garage. I figured it could be salvaged, or rebuilt as a spare.
My question to you fine gents is this.
Can my TH250C pump or torque converter work on my TH350?
I am strapped for cash, and would like to get my truck running.
Thank you for your time,
Irk

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Old 11-15-2006, 07:07 AM
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Question about the oil pump on a thm250

A thm250 achieves 2nd gear using a band,thm350s have clutchs for 2nd gear.

The 2nd gear clutch piston is housed on the pump [thm350],so you cannot use a 250 pump in place of a 350.

If both units were lockups-250c-350c then yes you could interchange converters,although the stall speed may be different.

You can't use a lockup converter in place of a nonlockup[notice the input shafts on each unit]. The lockup has a smooth polished end with an o'ring.

Many parts are interchangable though,in fact the sun gear shell may be considerably lighter in the 250c,I used one in my circle track car when we had to run automatics.

Good luck wuth your rebuild,I hope this helps.
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Old 11-15-2006, 05:23 PM
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250

if you only need the pump(front side) and both are lock up, you can use body and gears from 250 lock up to replace 350 lock up. the rear of pump (stator) cant not be used 250 to 350 as stated. converter should be fine between the 2 tranny interchange .
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Old 11-15-2006, 06:52 PM
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Gentlemen, I thank you for your advice.
I have talked to a few of my Chevy buddies. They feel the problem may be burnt frictions.
Here is the problem.
Shfit truck into drive, There is a very loud chattering noise that appears to come from the bell housing area. Heh, sounds almost like a diesal. Reverse still works without any problems.
I checked the fluid that night, engine running. I did not notice any burnt smells, the fluid was red and clear. Fluid level was in specs.
I would like to have an idea of whats wrong, before I head up to my friend's house this weekend.
Thank you for all the help!
Irk2
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Old 11-15-2006, 07:06 PM
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250

burnt plates won't make noise, sounds more in line of rear roller clutch broken or broken planet. check for broken or cracked flywheel and loose torque converter bolts. will it move forward in manual low?
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Old 11-15-2006, 08:39 PM
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Aw hell, I hope it's not a hard part that is broken. That would be the last thing I would need.
I have checked the Torque Converter and flexplate. That was the first thing. I even have a TC/Flexplate kit sitting in the glovebox.
The bolts are tight, much to my surprise.
Your suggestion about the planet gear sounds very likely. As for using low gear, I have not tried that yet.
Thank you.
Irk
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Old 11-20-2006, 06:54 PM
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Ok, I tore the transmission apart, and I found bits of what remains of my one-way roller. Now my final question for this thread.
I was under the assumption that I had a Turbo 350, but I found out that this transmission has a band.
Now, do I have a 250 without TCC, or am I just wrong? How do I know for sure what I have?
Thank you gents for the fine work.
Irk
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Old 11-20-2006, 07:12 PM
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350

350 has a kick down band and a set of large clutch plates behind the pump.
250 only has one wide band behind pump .
direct drum would have a roller clutch if you have 350
direct drum would Not have a roller clutch if you have a 250
but the easy way to tell if you have a 250 it has a band adjustment screw on out side of case Allen head center and 9/16 lock nut
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Old 11-20-2006, 07:42 PM
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Perfect!
I really appreciate your time!
I will start placing my orders tommorow, I should have them by the end of the week!
I cannot wait to get my poor truck running again. I have this lil lady that is waiting for me to come pay her a visit. I promised her that "I would come over to her house, look under her hood, and tinker with her motor."
That line works like a champ, everytime!
Irk
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Old 12-05-2006, 09:20 PM
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Ok folks. Here is the replay.
Rebuilt the transmission on sunday, and installed. The evening temperature dropped and I thought I would surely find myself in an early grave. While installing, the tranny slipped off the jack, and the T/C slipped partially out. When I bolted the tranny up, I noticed at that point the T/C was stacked. Argh, I cleaned up and headed home. Next night, I managed to loosen the tranny up and free the T/C. Installation proceeded smoothly. I took it for a test drive and everything seemed fine. I only had the lower four bolts in at the time, so I wasn't quite ready to test third out. I appreciate all of your help, but I have one question. Does anyone have any exploded diagrams for the TH-350? I doubt I will have too many problems, other then the fact that I forgot my anti-clunk spring, speedo clip broke, and I am somehow missing the piece that keeps the parking detent lined up. Other then that, tranny works great!
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