Hello, I am hoping to get some help and answers.
Bought a 73' 240z with a 4 speed that had no leaks (as PO claimed) It had no leaks because there was no fluid in tranny. Drained it and hardly any fluid poured out. Had some metal shavings After filling I find out there is a leak at the tail housing. I changed the seal (which was clearly damaged) with a National seal part#710324 This seal had a larger depth than the seal that it had. Had a terrible time trying to place it all the way in. Filled it up, went for a drive. Still leaking.
I did some researching found another part #3771 had the same inside/outside diameter and was closer to the depth of the ripped seal. Had an easier time installing this seal. Filled it up, went for a drive. Still leaking. Am I getting the wrong seals?
After both replacements I ran the car through all gears with the rear lifted and no leaks. Not sure if this is important.
I am guessing the metal shavings are from a bearing. So I am shopping around for a replacement kit. Zcardepot has only one kit with 6 bearings part#800-722 However I searched and found another site, that had rebuild kits for the F4W71B trans except now I see that they have 2 different kits. They have a kit for a F4W70B and F4W71B, with the 70B being sold as a kit for '70-'74 240&260 and the 71B being sold as a kit for '73-'84 260,280, & pickup. Part #'s BK105AWS and BK105WS respectively. These kits only come with 4 bearings as opposed to the Zcardepot kit with 6. So this has me seriously confused.
Looking at JDMjunkies there is no mention of a F4W70B. There are plenty of other sites that mention the 70B as the 240z Transmission
Since this car came with an L28 engine I am not 100% sure if the tranny was also swapped in. More searching and I see that the difference between 240 and 280 trans is a removable bellhousing. But there is conflicting information stating that the removable bell housing is only for the early 240z's with the 71A transmission. So more confusion.
I am hoping someone can give me some true clarification on all this. Thank you.