I've been looking everywhere. (Bolt pattern im looking for is from the trans to the bell housing not bell housing to engine)

3800 bell housing to t5 bolt pattern is it the same as the mustang bolt pattern? Is the 3800 t5 the same as the 2.2 s10 t5? Is the 3800 t5 the same as the v8 fbody t5?

Goal is to mate a tko600 to a 3800.

 

No, and you have to worry about input shaft lengths also. So you may have to get a FWD 3800 block to get the starter on the correct side if you want to try a 2.8 - 3.4 bellhousing for slave cylinder reasons, but all the V6 bellhousings will be to deep for the TKO600 intended for the V8 Chevy applications. Return your 600 and order a 600 that has the Mustang input and the Mustang case, then you can use the '96-'02 V6 Camaro bellhousing, but order it with the Camaro shifter location. The '93-'02 T5 used in V6 Camaros used the same 1.125" 26-spline clutch as '83-'92 V8 T5s, but the Mustang input will suffice, you just need a clutch disc that matches the input shaft, and a pressure plate that matches the flywheel. The flywheel may not accept a Mustang-size clutch disc, so you may need to have one built with the Mustang hub in a 3.8 friction. Any of the big names can easily assemble you one. Tell them you want a second as a spare if you like the first once you drive it, and if so, get the spare ASAP.

 

I cant just use a 3800 complete clutch kit???

 

Read it again, I explained why not.

 

Yes.
No, but both are Ford pattern.
3800 T5 is an F-body T5, so you may have to clarify your question.

What parts do you have in-hand already?
What measurements have you taken?