big_truxx
1/2 ton status
I have an 89 2wd burb w/ 6.2 and th400. I really want a th 700. I have located one and now need some help as I do not know anything really about trannies. 
1st off, will the th700 be the same length as the th400?
2nd is the th400 I have now a mech speedo or what? What year did they start going with the elec speedo setup anyway?

1st off, will the th700 be the same length as the th400?
2nd is the th400 I have now a mech speedo or what? What year did they start going with the elec speedo setup anyway?

I am really needing to know about mech/elec speedos and the lengths if they are the same or not 
