See if they list different flywheels for a th400 or a 700r4 looks like you may need a flexplate also

I think you're right.

I went to AutoZone today and ordered a $35.99 flexplate. They don't list the bolt spacing but hopefully this will work.


This product is a fit for your - 1988 Chevrolet Truck V10 Blazer 4WD 6.2L Diesel 8cyl
http://contentinfo.autozone.com/znet...A-143/image/4/

You called it. I checked it this weekend and:

TH400 flexplate is GM # 14077157

700R4 flexplate is GM # 14077158



AutoZone has it as part number FRA-142
http://contentinfo.autozone.com/znet...A-142/image/3/

The teeth, the pitch and the OD size are all the same.
It's just the friggin bolt spacing to the torque converter that's different.
It looks like the TH400 converter is spaced apart by about an extra 1/2".
:sFun_bangdesk:

http://i.imgur.com/iWKad22.jpg

That sucks but you got plenty of time to plow lol

Update:

The th400 is in and the truck has been working great, except....the transfer case is leaking a lot of transmission fluid.

I think there might be a seal between the transmission and the transfer case that is screwed up.

is it the case or the trans? the gasket on the housing adapter is the rear trans seal. the t case has an input seal and rarely leaks there.

It looks like it's coming from the transfer case but I'm not sure what part is leaking. It's a NP 208.

I keep filling the transfer case with trans fluid and I just put in another 1/2 quart.

Mike...this is going to sound real off but I'm not sure what the fluid level is of the trans right now.

The th400 that replaced the 700r4 lines up totally different for the dipstick tube. I had a flexible braided line dipstick tube in, but it was impossible to read and eventually it just curled up and the dipstick won't even go in.

Anyway, after a few hours of putting three holes in the body, I'm pretty close to getting a shortened tube into the cab. True redneck trans fluid checking. lol. I can check it while I drive.

Anyway, I should know tomorrow how low the trans fluid is.

NP208 were prone to stress cracking. I've learned also there was issues with it wearing from within. (see vid)
But I lucked out on mine years ago and had a seal leak.
https://www.youtube.com/watch?v=Nj5ZS8wOmNk

yeah either pump grooves out the case or the chain wears threw the case. either way just keep it full for a part time truck.