700r4 to adapter bolts

[Kenny78]

Hey fellas, I crawled under my blazer(85 with np208) and found the adapter to trans bolts loose/stripped missing! The two pass bolts tightened up but the top drivers is stripped. I'll disassemble to repair soon but would like it mobile for the weather that's coming. I forgot to bring the bolt to match it up.

Does anyone know the specs? It has a 15mm head so I vould buy fine and coarse in various lengths but would prefer to get the correct ones. Thanks

 

[skunked]

I believe they're 10mm on those 700's, probably 1.5 pitch. Don't be surprised if the threads are fubbard in the trans, fairly common if the adapter came loose.

 

[Kenny78]

Yeah one is. I will feel ok short term if the missing one will snug up. I mean I as driving it around with only the crossmember for who knows how long...

 

[Greg Ducato]

10x1.50, plan to heli coil

 

[sweetk30]

10x1.50, plan to heli coil

what about tap to next size closest like American ?

and yes I know heli coil is strongest in aluminum for thread strength .

 

[Greg Ducato]

Closest is 3/8 but that is smaller, there isn't enough meat at the trans housing to go to 7/16

 

[sweetk30]

Closest is 3/8 but that is smaller, there isn't enough meat at the trans housing to go to 7/16

that sucks . . . . o.k.

 

[mrk5]

I think on the top bolts a person could use a nut and bolt if needed.

 

[Greg Ducato]

Yes, you probably could, might have to clearance the nuts a little depending on the casting but it could be done in a pinch.

 

[diesel4me]

I saw a TH350 on a 4x4 at a junkyard that had those two top holes stripped out--whoever fixed it just used two of those square nuts like Unistrut uses with 3/8" bolts behind the bolt hole on the transmission output area of the case--looked like they had to grind down one side on the nut, to allow it to line up with the bolt hole..looked like it had been run a long time that way too...probably stronger than the aluminum threads were originally..