Do you want the official torque specs or what I tighten them to?
I just finished assembling my own trans today but my specs are
a little "off" by the book, mainly because I am a Heli-Coil fanatic....
So pondering it for a bit I'll give you the book specs:
top cover 12-16ft/lb
Tailshaft housing to main case:24-34ft/lb
Bellhousing to Engine 28-38ft/lb
and even though you didn't ask,
on the flywheel to engine bolts 47-52ft/lb
Personally I go 40-45ft/lb on the tailshaft bolts,
45-50ft/lb on the bellhousing bolts
and 55ft/lb on the flywheel-to-crankshaft bolts.
the tailshaft housing gets tightened to 35ftlb after sealing it with "Ultra grey"
silicone but after the sealant has several hours to cure I remove the bolts
one at a time, apply never-seeze and reinstall them. after I have never
seezed them all I retighten to 40ft/lb
Please note that six of the eight tailshaft to maincase bolts are "through holes"
meaining that the tip of the bolt sticks out through the flange on the case
this means that the steel bolt in contact with the unprotected aluminum can
get wet (road salt!)
On Bellhousing to block bolts, People must not tighten these because
from my experience (and rboyer will likely confirm) it is common to go
to pull a trans in the junkyard and find half of them missing.
the bolts holes I ALWAYS heli-coil are the bolt holes for the starter mount
(ever had a dead starter and a seized bolt at the same time? trust me it's ugly)
And the two holes for the transmission mount on the tailshaft housing.
Everyone gets those holes helicoiled for free
(aggrevation prevention, MY aggrevation, not theirs.)
It saves me from having someone whining about stripping one of them
(usually the one on the passenger side) because they over tightened them
On my OWN transmission I helicoil all twelve bearing retainer bolt holes
Typically with self-locking coils (it turns the bolt hole in an elastic stop nut)
and saves me the use and mess of Loctite, and I put a special O-ringed
crush washer (called a Stat-O-Seal) under the front bearing retainer
bolt heads.
And most of the helicoils are not the same standard length crap that
people buy in their local auto parts store
Front bearing retainer takes 16mm long 8mmx1.25 coils
and the top two must be shortened by one turn.
the rear bearing retainer will accept the standard length 8mm coils (12mm long)
coil but again the top two must be trimmed.
the mount for the slave cylinder gets a 20mm long 8mmx1.25 coil
the starter mount takes two 10mmx1.5 coil 30mm long
And the tailshaft takes a 1/2"-13 (english thread) coil
(I forget the length offhand)
Oh I would do all this for other people, but with helicoils averaging
$12 per hole and the stat-o-seals being almost $2 each not many
people are willing to spring for it...
Right about now some people should be getting a clue why I only
break "the weird shit" on my truck...
You should see what I do to front axle shafts before I'll use them
AD