35 Turbo or 700R4?s HELP!!

volsrock · Posted: Fri Sep 05, 2008 11:57 pm Post subject: 35 Turbo or 700R4?s HELP!!

Ok

I got a 1978 El Camino the other day with no motor but has a good 350 turbo trans in it

I am putting in a 305 out of a 1984 Pontiac Parisienne that has 40000 on it...it has the 700R4 trans in it

It would be easy just to put the new motor in and hook it up to the 350 turbo cause its already in the car and no drive shaft work etc.

But I read that MPG will be much better wuth the 700R4

But then i also read that this 700R4 is JUNK cause its a pre 1987

I dont want to put it in and it go out in 10k miles etc.

I would rather use the 350 turbo FOR THE TIME BEING till i got the $$$ to get a later model 700

I dont do much interstate driving at all...just drive around town under 60 mph

What would you guys do?

The 1984 700R4 or the 250 Turbo for the time being?

dougs85 · Posted: Sat Sep 06, 2008 1:23 am Post subject:

Nothing wrong with a TH350 with the right rear axle ratio ie. 2.41, 2.73. If I was going to buy a trans I would go for a 200R4, same length as the TH350, no drive shaft length mods required and a very good transmission. As I recall the best ones are '86 and later.

Can't tell you much about the 700R4, but I doubt it would be troublesome behind a 305 engine.

Doug
_________________
85 El Camino 305, TH350, K&N, dual exhausts
87 El Camino 305, 2004R, K&N, dual exhausts
1964-1/2 Mustang conv, 260 V8, dual exhausts
2002 Jaguar XJ8, 2000 Harley Road King
Lakewood, CO

65 ELKY · Posted: Sat Sep 06, 2008 3:58 am Post subject:

Just like Doug said you will have to modify your drive shaft and change your shifter. 350 has 1 2 D and the 700 has 1 2 3 D . The cross member will have to move.
_________________
www.cprstreetmachines.com
T-70 TURBO INSTALL EARLY NOV
SAN DIEGO, CA

volsrock · Posted: Sat Sep 06, 2008 10:12 am Post subject:

2.41, 2.73 gears?

What did the car come with in 1978 with a 305?

dougs85 · Posted: Tue Sep 09, 2008 5:44 pm Post subject: