Who is the Transmission Guru ???
 

Hey guys i,m looking to tackle this nasty 30 year old transmission leak this weekend, However i cant remember if this is a Borg Warner 12 or a GM 400 Can any of you tell by the horrible oil stained picture i took.. Thanks in advance. 1976
https://cimg2.ibsrv.net/gimg/www.jag...0fa4b6b3d5.jpg
I,m thinking it is a Borg Warner 12 ( if i remember correctly ) Thanks

Looks BW12 to me, but its many years since I looked.

Is the vac modulator on the RH side of the casing, just above the gasket line, near the front = TH400

Vac modulator on the LH rear, on the reaa face = BW12.

XJS had TH400 , the earlier XJ12 had the BW12, but the crankshaft was different also on the V12, to take the converter snout, sooooooo, being a Chev, and maybe a 5/8 crank hole, a BW12 was used, as that converter has the snout to suit that hole. The TH400 snout was more a "dome" as apposed to a "shaft" style of teh BW12.

I will put it up the ramps and look under it, but it is being run by a chevy V-8 so it makes me lean towards the BW Thank you. I will let you know as soon as i get under it.

The BW12 pan gasket is almost square. The TH400 is very irregular.

As far as I know the XJS used the BW12 until May 1977 or thereabouts

https://cimg9.ibsrv.net/gimg/www.jag...563b63dc26.png
https://cimg1.ibsrv.net/gimg/www.jag...333c15eb3d.jpg


Cheers
DD

You guys are the BEST! !!!!!!!