New to the Game (need help) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jetmech727 · 09-17-2004, 04:15 AM

I recently purchased a 1970 chevy truck 1/2 t. I am going to convert it from a man to auto trans. Could you please enlighten me as to what I will need to do this job (parts wise). Also will I have to have a double hump cross member to run duel pipes or does the standard cross member work ok? Thanks in advance for the help.

Blue Beard · 09-17-2004, 04:31 AM

You need to figure out which trans you want to use first.

350, 700r4

dyingdeadman · 09-17-2004, 04:42 AM

also need to know if you want floor shift or colum shift, if you want automatic on the colum you probely will have to change that out too.

Jetmech727 · 09-17-2004, 04:49 AM

I will be using a 350 trans for the simple fact that I have one already. What is the most most economical way to go with the shift (floor or colum) really doesn't matter to me. I just want it to be right. I going to a swapp meet this weekend and I really only have a rough idea of what I need.

**JIMs70GMC** · 09-17-2004, 06:31 AM

Get a auto cross member, auto steering column/linkeage, radiator for an auto for cooling will need cooling lines also. On the cross member I believe the manual tranny cross member will not work. Not sure on the rear driveshaft length either.

MACKL · 09-17-2004, 07:41 AM

Drive shaft length is the same, the yoke is different. If you use the manual yoke, (it will fit), you will have tranny fluid run out all over you drive way. The manual yoke has some kind of a vent hole in the center. I found this out the hard way. Really messed up my driveway. The wife almost killed me.
The low hump will work, the cross member is the big difference. Removing the manual cross member is a pain.
locating trans cooling lines give most people problems too. Watch for them at the swap meet or you can bend your own. Good luck...Kelly

Tx Firefighter · 09-17-2004, 08:10 AM

You can't blanket say the driveshaft wil work without changing the length.

There are 3 different lengths of tailshafts on Th350 trans, 6, 9, and 12 inch. It depends on which length trans he has to use.

Brainchild · 09-17-2004, 09:20 AM

A lot of times it's cheaper to buy a wrecked truck with all the stuff you need for a hundred buck or so than to track all the stuff down.

Putter · 09-17-2004, 10:22 AM

I agree with brainshild on that one. If you have a complete donor, it helps out.

Oh, welcome from Central Mississippi.

09-17-2004, 04:15 AM	#1
Jetmech727 Registered User Join Date: Sep 2004 Location: Indianapolis,IN Posts: 148	New to the Game (need help) I recently purchased a 1970 chevy truck 1/2 t. I am going to convert it from a man to auto trans. Could you please enlighten me as to what I will need to do this job (parts wise). Also will I have to have a double hump cross member to run duel pipes or does the standard cross member work ok? Thanks in advance for the help.

09-17-2004, 04:31 AM	#2
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,834	You need to figure out which trans you want to use first. 350, 700r4 __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

09-17-2004, 04:42 AM	#3
dyingdeadman Registered User Join Date: Aug 2004 Location: san marcos,tx Posts: 266	also need to know if you want floor shift or colum shift, if you want automatic on the colum you probely will have to change that out too. __________________ 72 GMC sierra 3/4 ton 402 bb 68 GMC 3/4 ton 2010 camaro rs: daily driver

09-17-2004, 04:49 AM	#4
Jetmech727 Registered User Join Date: Sep 2004 Location: Indianapolis,IN Posts: 148	I will be using a 350 trans for the simple fact that I have one already. What is the most most economical way to go with the shift (floor or colum) really doesn't matter to me. I just want it to be right. I going to a swapp meet this weekend and I really only have a rough idea of what I need. Last edited by Jetmech727; 09-17-2004 at 04:53 AM. Reason: adding

09-17-2004, 06:31 AM	#5
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Get a auto cross member, auto steering column/linkeage, radiator for an auto for cooling will need cooling lines also. On the cross member I believe the manual tranny cross member will not work. Not sure on the rear driveshaft length either. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

09-17-2004, 07:41 AM	#6
MACKL Almost done! Join Date: Apr 2004 Location: Woodstock GA Posts: 193	Drive shaft length is the same, the yoke is different. If you use the manual yoke, (it will fit), you will have tranny fluid run out all over you drive way. The manual yoke has some kind of a vent hole in the center. I found this out the hard way. Really messed up my driveway. The wife almost killed me. The low hump will work, the cross member is the big difference. Removing the manual cross member is a pain. locating trans cooling lines give most people problems too. Watch for them at the swap meet or you can bend your own. Good luck...Kelly __________________ The 1970 SWB Project Removed 6cyl manual trans, manual everything V8-350 Auto/PS/PDB Blazer Fuel Tank Behind the Marker Light Fuel Fill

09-17-2004, 08:10 AM	#7
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	You can't blanket say the driveshaft wil work without changing the length. There are 3 different lengths of tailshafts on Th350 trans, 6, 9, and 12 inch. It depends on which length trans he has to use. __________________ I'm on the Instagram- @Gearhead_Kevin

09-17-2004, 09:20 AM	#8
Brainchild Still drivin' a Rat Rod Join Date: Sep 2004 Location: Monett Missouri Posts: 4,925	A lot of times it's cheaper to buy a wrecked truck with all the stuff you need for a hundred buck or so than to track all the stuff down. __________________ Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the a$# 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website

09-17-2004, 10:22 AM	#9
Putter More Cowbell.... Join Date: Mar 2004 Location: Puckett, MS Posts: 3,569	I agree with brainshild on that one. If you have a complete donor, it helps out. Oh, welcome from Central Mississippi. __________________ *There once was a member from Puckett.....Who ( fill in the blank blank blank* ) bucket**



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