th400 to 203/205 doubler bolts size?

[rhinoblzr]

I went to install my doubler today and when i went to mate the trans to the doubler before putting in the truck. the flange for the 400 HD round pattern are threaded smaller than my 203 round pattern. should i just drill the trans out bigger or am i missing something here? thanks

 

[nvrenuf]

The 400 case should be 3/8". My ORD Doubler used all 3/8" hardware.

 

[rhinoblzr]

just double checked and its 3/8 on the trans. 3/8 is to small for the doubler. guess im going to drill the trans and tap the doubler for 1/2, and try to contain the shavings with grease and a magnet on the doubler. I think every hole must of been stripped or somethin. Buying used is paying off. lol.

 

[nvrenuf]

Iirc none of the holes on the doubler adapter are threaded. What brand is yours?

 

[rhinoblzr]

Idk for sure no markings. Looks ord if anything. If the doubler is not threaded and only the tranny is, then how do they attach to each other ? 1/2 lol. I picked up some 7/16 bolts i'll see what happens when i get home.

 

[nvrenuf]

For both sides, some are bolts and some are studs.

 

[rhinoblzr]

Gotta be missing somethin here.

 

[Justin V]

Looks like you need to unbolt the adapter/mount from the front of the t-case. Then bolt it to your 400 first. From the inside. Then bolt the t-case back up.

 

[sweetk30]

yep th400/203 gets adaptor on tranny first before adaptor to the rangebox / or 203 transfercase.

and the factory bolts QTY6 will have orings with them to seal them . atleast the ones I have pulled apart did that I recall.

 

[rhinoblzr]

Yes yes yes, super thanks guys, i thought about that but didnt know if the bolt head would fit in there. Cool im back on track. Thanks again