Trans good or bad

david 87 · 03-30-2008, 12:07 PM

i have a 87 chevy with a 700R4 it needs rebuilt. rebuild it or put a 400 or 350 in its place

Chevy_Finatic79 · 03-30-2008, 12:39 PM

First an 87 should be TBI if it is you want to stick with the 700R4 for a couple reasons. a 350 is shorter than the 700R4 and the 400 so you would need a longer driveshaft. and the 350 dosent have overdrive which ive been told the TBI systems need in order to "save" gas MPG on the highway. and you have to buy an aftermarket Vehicle Speed Sensor to talk with the ECM
The 400 has a bigger output shaft which would mean at least a new yoke and or a different driveshaft. it too is a 3 speed no overdrive. but the kickdown can be controlled by the ECM and i think you need an aftermarket speed sensor for that one too.
Thats all I got

PAPA BEAR · 03-30-2008, 04:19 PM

700R4 is a good transmission and can be made stronger if you need . Up grades are available when rebuilding such as beast sun shell steel pistons instead of aluminum shift kits etcetera .. But good luck which ever way you go

03-30-2008, 12:07 PM	#1
david 87 Full Member Join Date: Mar 2008 Location: Missouri Posts: 11	Trans good or bad i have a 87 chevy with a 700R4 it needs rebuilt. rebuild it or put a 400 or 350 in its place

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03-30-2008, 12:39 PM	#2
Chevy_Finatic79 Senior Member Join Date: Mar 2008 Location: Lincoln NE Posts: 478	First an 87 should be TBI if it is you want to stick with the 700R4 for a couple reasons. a 350 is shorter than the 700R4 and the 400 so you would need a longer driveshaft. and the 350 dosent have overdrive which ive been told the TBI systems need in order to "save" gas MPG on the highway. and you have to buy an aftermarket Vehicle Speed Sensor to talk with the ECM The 400 has a bigger output shaft which would mean at least a new yoke and or a different driveshaft. it too is a 3 speed no overdrive. but the kickdown can be controlled by the ECM and i think you need an aftermarket speed sensor for that one too. Thats all I got

03-30-2008, 04:19 PM	#3
PAPA BEAR Senior Member Join Date: Mar 2008 Location: virginia Posts: 131	700R4 is a good transmission and can be made stronger if you need . Up grades are available when rebuilding such as beast sun shell steel pistons instead of aluminum shift kits etcetera .. But good luck which ever way you go