th400 LONGTAIL wanted NJ - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**old Rusty C10** · 03-21-2005, 05:40 PM

anyone local enough have a good used working th400 LONGTAIL trans up for sale? I will come pick up within like 100-200 miles

**crossy** · 03-21-2005, 07:06 PM

yep, and you know where I live :-) .
I was just going to post this ad in the 88-98 forums.

(1) TH350 long tail, known good, NON-lockup. Chevy bolt pattern. $75

(1) TH-400 longtail, 2WD, small output, VERY hard to come by as a direct replacement for a 700R4, same length & output size. Chevy pattern, Known good, I drove the truck here. Only one of these I've ever had! $175.

**old Rusty C10** · 03-22-2005, 12:49 AM

small output? thats the small tailshaft i need the long one

muddyole 69 · 03-22-2005, 06:34 AM

got one in se ohio 125 and shipping its yours lmk mike see my post on parting out van

MylilBowTie · 03-22-2005, 10:11 AM

Quote:

Originally Posted by crossy

(1) TH-400 longtail, 2WD, small output, VERY hard to come by as a direct replacement for a 700R4, same length & output size. Chevy pattern, Known good, I drove the truck here. Only one of these I've ever had! $175.

Im pretty sure you are talking about a THM-375. Basically a th350 in a th400 case. There is a tag on it and that if it can be decoded will be able to better identify it.

http://www.nastyz28.com/transid.html

Cant find any pictures of the tailshaft. But it usually has THM-375 on the bottom of the tailshaft where the transmission mount goes.

Edit: The THM-375 has a small shaft and same spline count as a th350. Technically is a th400 or a mildly beefed up version of a th350 its really a mix between the two.

**crossy** · 03-22-2005, 11:31 AM

TH400 LONG TAIL is the last one in pic, th350 long tail in front of that and typical th350 shortail in the front, notice I have all the tails against the wall so you can see how much longer. truck I pulled it from had an M40 RPO code.
Th400 is 34.5" long overall,
center one is 31.5"
and shortail is 28.5"

I measure from the front-most edge of bellhousing ,at the dowel pin hole, to the back edge of tail housing, did not include the little bit of the spline that sticks out.
also measuring from the same spot rearwards to the center of the mounting boss on the TH400 is appx. 27-1/2". will someone measure their 700R4 for me. thanx , DAVE

MylilBowTie · 03-22-2005, 04:02 PM

Im not trying to pick on you or anything. But does the th400 have 4 or 6 bolts holding on the tailshaft? Im pretty sure its a th-375, especially with the way the tailshaft looks and that a th350 yoke will fit it.

Its more out of self curiosity than anything.

**crossy** · 03-22-2005, 07:00 PM

Hey even after 20+ years on these there isn't a week that goes by that i don't find out something new. I will have to go back down to the storage garage to look at that ,but I know it has a th400 pan. For years I thought a 375 was scritcly a gm big car FWD( toronado/ Cadillac) trans, or was that a 425?, Now that center trans caused me and PHILATRUCK a lot of grief in the driveshaft dept. It was in an 83, but no idea if it was original or not but is the length that needed a two piece driveshaft, another mystery of our trucks , we'll save that for another table discussion :-) . DAVE

I still want someone to measure up a 2WD 700 R4 for us all to compare to this TH400?

Anyone remember the throw-away th125?

03-21-2005, 05:40 PM	#1
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,313	th400 LONGTAIL wanted NJ anyone local enough have a good used working th400 LONGTAIL trans up for sale? I will come pick up within like 100-200 miles __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

03-21-2005, 07:06 PM	#2
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	yep, and you know where I live :-) . I was just going to post this ad in the 88-98 forums. (1) TH350 long tail, known good, NON-lockup. Chevy bolt pattern. $75 (1) TH-400 longtail, 2WD, small output, VERY hard to come by as a direct replacement for a 700R4, same length & output size. Chevy pattern, Known good, I drove the truck here. Only one of these I've ever had! $175. __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.

03-22-2005, 12:49 AM	#3
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,313	small output? thats the small tailshaft i need the long one __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

03-22-2005, 06:34 AM	#4
muddyole 69 Senior Member Join Date: Jan 2004 Location: SE Ohio Posts: 1,121	trans got one in se ohio 125 and shipping its yours lmk mike see my post on parting out van __________________ hav'n fun be'n me

03-22-2005, 11:31 AM	#6
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	TH400 LONG TAIL is the last one in pic, th350 long tail in front of that and typical th350 shortail in the front, notice I have all the tails against the wall so you can see how much longer. truck I pulled it from had an M40 RPO code. Th400 is 34.5" long overall, center one is 31.5" and shortail is 28.5" I measure from the front-most edge of bellhousing ,at the dowel pin hole, to the back edge of tail housing, did not include the little bit of the spline that sticks out. also measuring from the same spot rearwards to the center of the mounting boss on the TH400 is appx. 27-1/2". will someone measure their 700R4 for me. thanx , DAVE Attached Images __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.

03-22-2005, 04:02 PM	#7
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Im not trying to pick on you or anything. But does the th400 have 4 or 6 bolts holding on the tailshaft? Im pretty sure its a th-375, especially with the way the tailshaft looks and that a th350 yoke will fit it. Its more out of self curiosity than anything. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

03-22-2005, 07:00 PM	#8
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	Hey even after 20+ years on these there isn't a week that goes by that i don't find out something new. I will have to go back down to the storage garage to look at that ,but I know it has a th400 pan. For years I thought a 375 was scritcly a gm big car FWD( toronado/ Cadillac) trans, or was that a 425?, Now that center trans caused me and PHILATRUCK a lot of grief in the driveshaft dept. It was in an 83, but no idea if it was original or not but is the length that needed a two piece driveshaft, another mystery of our trucks , we'll save that for another table discussion :-) . DAVE I still want someone to measure up a 2WD 700 R4 for us all to compare to this TH400? Anyone remember the throw-away th125? __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks. Last edited by crossy; 03-23-2005 at 06:26 PM.



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