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I have a severe leak at the rear housing on the transmission. Had the rear seal replaced while the shop was rebuilding the transfer case. The transmission mount is right in the way of this housing that has the leak. Do I need to support the transmission before I remove the rear mount? Also the mount looks a little complicated, how many bolts hold this mount?
Thanks for any help.
You should support it before you remove that rear mount.
Here is an image of the mount and bolts and all:
http://www.m715zone.com/jonmisc/fig5.jpg
Need more? Just ask.
Thanks Brute.
the leak may also be from the studs/bolts #7 in the above detail. Use Permatex when reassembling.
Yes, good point.
On mine those are bolts...and one of them was leaking. I found it was loose and tightened it only to find that it fell out about a year later. I examined the thread and found them to be wider apart than a new bolt as the high parts were worn thinner...presumably from being loose and being knocked around in the hole. Bought new bolts and put them in with permatex...that was 10 years ago and no problems since.
If memory serves correctly, the lower one is in the fluid when the trans is properly filled and the upper one isnt...but maybe both are...its been a decade...
Thanks for the replies fellows. It was the left hand bolt (no stud) that was leaking. I will use permatex when I put it back together. Would you use the permatex that hardens or not. Any suggestions on where I can find a transmission insulator, transmission oil has softened mine to it is almost coming a part.
Thanks again.
I have had really good luck using the liquid teflon pipe thread sealant in these kind of applications. Just about any hardware store has it.
You will want an "anaerobic" or non-hardening sealer for use on threads.
The mount is probably available from either Memphis equipment or VPW.
That mount looks suspiciously like a GM TH400 rear trans mount from a mid 70's passenger car. Might be worth a comparison?Quote:
Originally Posted by brute4c
I think I have seen the retangular mount on ebay several times, but I dont know about the round one next to it.
Memphis Equipment has one on Ebay currently, auction # 220274979248
http://cgi.ebay.com/ebaymotors/M715-...spagenameZWDVW
Also AB Linn has had them in the past, usually the cheapest.
Thanks Hiker, I'll call Memphis tomorrow.
Got my truck back together this afternoon, what a chore! Ran out of time, just need to refill it with gear oil and test drive. At least everything is clean under there now.
Thanks for everyones help and suggestions. Thought I would post a picture.
[img=http://img241.imageshack.us/img241/3931/m715eeh9.th.jpg]
Nice looking truck!!
I get to do this project this weekend to seal up the bolts. Thought it was the rear seal but discovered that its not leaking - must be the bolts.
If you unbolt the crossmember and the trans mount, will the crossmember just slide back? Enough to get to the bolts?
Txs
8 bolts hold the transmission crossmember on. Undo them and attack the crossmember with a BFH once you support the transmission. Just watch the clearance for the front drive shaft if you go too far.
However, I think you are making this harder than it should be. A combination wrench should let you get to each and every bolt with some creative arm positioning. I just looked at 2 of the T98's sitting in my class and I am pretty sure you don't need to move stuff out of the way to get to the rear seal housing.
Correct, you can get to the seal housing but not the mounting bolts (#7 in the diagram). Those are what I think is leaking.Quote:
Originally Posted by Barrman
And those bolts love to leak...
Check the threads to see if they have been flattened or widened over the years...replace if they dont look up to snuff.
Use some threadlocker on them and snug them up good...they love to work loose.
Pulled the crossmember and trans mount. The bolts were tight but looked like the lower was leaking. Reassembled with a little sealant.
Kinda of a pain but worth it.
The Quirks manual says to periodically tighten the rear transmission bolts, however, it's not that simple, and I found that the rear passenger side bolt goes through into the oil, and the bolt had weakened threads and had to be replaced, not just tightened. My question/recommendation would be to drill holes into the cross member to allow easy access to the two bolts for removal of the bolts without disassembly of the support and cross-member. I think the cross-member is strong enough with two holes to access the tranny bolts. Has anyone tried this? Recommendations?
I dont remember anyone ever mentioning doing that but I do agree that there should be plenty of strength in that part to be able to take a couple of holes...
Make sure you use some kind of either sealant or lockwasher or something on there to keep them in place too...sice we know they are prone to loosening up/coming out...