Enlighten Me

[zukirider21]

okay so after some time on trs, heres what ive gathered:

-between the 7.5" and 8.8" rear, there are essentially 2 different pinion flange bolt patterns; "large" and "small".

-most 7.5'' rears use the small pattern and most 8.8" rears (all explorers) use the large pattern

now heres my actual question:

i picked up a 1978 302/c6 combo for my truck. the tranny has a pretty big yoke on it, so i'll assume its a "1350" size unit.

currently, i have some tiny crap for u joints, so ill assume theyre "1310" size.

i would like to get this driveshaft: http://www.summitracing.com/parts/STR-U1699/ custom built. its dirt cheap and from a great company that i know will stand behind it if anything should fail.

so, is there a 1350 size pinion flange yoke for the small bolt pattern available? if no, do they make a 1350x1330 combination joint? because worst case, im pretty sure theres a 1330 size unit available for the small pattern. and when i eventually upgrade to my explorer 8.8, i know i can get a 1350 size unit for the large pattern.

 

[rockwerks]

what exactly was the 302/C6 out of? How do you know it's C6 and not a C4?

 

[Mac]

Combo jopints are all covered here at the bottom of the link. The slip part of a C-6 yoke is 1.687" in dia, that portion on a C-4 is 1.500" in dia

dave
http://www.therangerstation.com/Magazine/summer2008/ujoints.htm

 

[zukirider21]

alright thanks for the replies, and im positive its a c6. ive worked on a few c4's and this dwarfs them.

but after reading that article, it makes the "1310" look pretty sizeable. mine are not. perhaps my truck has a different size?

 

[4x4junkie]

You probably have the dinky little 1210 joints.

Flanges for 1310s are available for both the large & small pinion flanges. They should be fine for anything a 302 can dish out (provided your axles are geared correctly for the tires you're running).

 

[zukirider21]

yeah theyre pretty puss 1210 sounds more like it.

my plan is to run the 7.5 (3.45) gears till it blows then switch to a 31 spline 8.8 with 4.11's or maybe even 4.56's