68 305E v6 Manual to auto swap, HELP - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68305E · 12-23-2004, 12:01 PM

Ok fellas, I am working on a major restoration on my late brothers truck and I need some major help from guys who are experienced with these trucks. Feel free to Read the story and see restoration pics at www.jakesgeneralstore.com scroll down to 68 GMC Lost now found.

It is a 1968 GMC 3/4 ton 4x4, 305EV6 4 sp, manual steering and Brakes. I want to keep the 305EV6 motor and convert the truck to an auto and put power steering and brakes in it. I know the easy solution for the auto trans would be to dump the V6 for a more common motor but this motor in my opinion is what makes this truck so cool. Does anyone know what auto trans will bolt up to this V6 Block? I need to hook up with some V6 People. I have had one suggestion of a guy making an adapter plate, which is our plan now but I am not pleased about it.

I also want to ad power steering but I am hitting road blocks there. I am told they did have power steering in a 68 4x4. I need a stuff to convert. I have tried aftermarket and they only make kits for 69 4x4 and up and 67-68 2wd

I would appreciate anyone's help with this project. We have started to put the auto colum and auto pedals in. I just dont want to go back to the 4 spd..
Thanks
Jake
jakem@starband.net

**CPNE** · 12-23-2004, 12:13 PM

First welcome and Merry Christmas.

Second, the story of your GMC is one of the coolest I've read. She deserves a new lease on life.

I can't help with your question but try contacting one our members named Erl via personal message. He has a 68 GMC 4x4 with the 305 V6 and did a PS conversion IIRC.

There is also a sight dedicated to the GMC V6's but the URL escapes me. Erl and others can point you to it.

Here is Erl's truck. I don't think he'll mind me showing it off. It is my all-time favorite truck on this site. When done, yours will rival it.

68305E · 12-23-2004, 12:20 PM

thanks, wow, that truck is darn cool. hope mine turns out that nice.

**CPNE** · 12-23-2004, 12:24 PM

Here is the GMC V6 site

68305E · 12-23-2004, 01:03 PM

Thank you thank you thank you...I found a guy who is about 25 miles from me who makes the conversion kit wow. ALl this in less than 30 minites. You gotta love the internet. Here I was sweatin bullets. http://www.transmissionadapters.com/
there is also a lot of good stuff on performance upgrades. Thanks again. Now I just gotta figure out the power steering.

HOTFUN · 12-23-2004, 01:25 PM

68305E
Not sure where you live but I have a 60k mile 67 3/4 2 wd with a turbo 400 tranny and it is complete and drives. Motor has a rod knocking but it still drives to town. Not sure if there is an adapter palte or what on the engine for the tranny but I will be taking this drivetrain out soon and parting. It is a 305 V6 with power steering and brakes. The ps pump and brackets would work for you and I'm sure the gear box for a 68 4wd would be the same for any Chevy/ GMC 68 through 79 4WD. If you have any interest let me know as I am open on tearing it down. I would like to sell the motor/tranny complete. It does have power brakes also but again mine is a 2 WD 3/4 ton.
Mark

68305E · 12-23-2004, 01:31 PM

I would like it all but I am told that 4x4 and 2wd stuff does not interchange. Not sure the trans would work cause i need a short shaft to bolt up to the T-Case. I will keep this in mind. Thank you very much for the info..
Jake

12-23-2004, 12:01 PM	#1
68305E Registered User Join Date: Dec 2004 Posts: 8	68 305E v6 Manual to auto swap, HELP Ok fellas, I am working on a major restoration on my late brothers truck and I need some major help from guys who are experienced with these trucks. Feel free to Read the story and see restoration pics at www.jakesgeneralstore.com scroll down to 68 GMC Lost now found. It is a 1968 GMC 3/4 ton 4x4, 305EV6 4 sp, manual steering and Brakes. I want to keep the 305EV6 motor and convert the truck to an auto and put power steering and brakes in it. I know the easy solution for the auto trans would be to dump the V6 for a more common motor but this motor in my opinion is what makes this truck so cool. Does anyone know what auto trans will bolt up to this V6 Block? I need to hook up with some V6 People. I have had one suggestion of a guy making an adapter plate, which is our plan now but I am not pleased about it. I also want to ad power steering but I am hitting road blocks there. I am told they did have power steering in a 68 4x4. I need a stuff to convert. I have tried aftermarket and they only make kits for 69 4x4 and up and 67-68 2wd I would appreciate anyone's help with this project. We have started to put the auto colum and auto pedals in. I just dont want to go back to the 4 spd.. Thanks Jake jakem@starband.net

12-23-2004, 12:13 PM	#2
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	First welcome and Merry Christmas. Second, the story of your GMC is one of the coolest I've read. She deserves a new lease on life. I can't help with your question but try contacting one our members named Erl via personal message. He has a 68 GMC 4x4 with the 305 V6 and did a PS conversion IIRC. There is also a sight dedicated to the GMC V6's but the URL escapes me. Erl and others can point you to it. Here is Erl's truck. I don't think he'll mind me showing it off. It is my all-time favorite truck on this site. When done, yours will rival it. Attached Images __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

12-23-2004, 12:24 PM	#4
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	Here is the GMC V6 site __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

12-23-2004, 01:25 PM	#6
HOTFUN Registered User Join Date: Jan 2001 Location: Lincoln, Nebraska Posts: 2,144	68305E Not sure where you live but I have a 60k mile 67 3/4 2 wd with a turbo 400 tranny and it is complete and drives. Motor has a rod knocking but it still drives to town. Not sure if there is an adapter palte or what on the engine for the tranny but I will be taking this drivetrain out soon and parting. It is a 305 V6 with power steering and brakes. The ps pump and brackets would work for you and I'm sure the gear box for a 68 4wd would be the same for any Chevy/ GMC 68 through 79 4WD. If you have any interest let me know as I am open on tearing it down. I would like to sell the motor/tranny complete. It does have power brakes also but again mine is a 2 WD 3/4 ton. Mark __________________ '66 CST BBW swb fleet 327 fac ac '67 CST 4x4 swb 327 stepside project '72 Cheyenne K20 50k original '72 Cheyenne Super K20 project '73 Sierra swb 4x4 frame off in paint stage '74 Cheyenne Super swb w/16k actual '71 & 72 Cheyenne K10 4x4 swb's '70 426 HEMICUDA conv SHAKER 4 sp Dana 60 '60 Impala conv 327 PG fac ac loaded 3rd owner '72 GMC K2500 4x4 '59 Apache CST BBW fleetside swb 283 '73 ElCamino SS LS1 T56 true SS bucket tach '76 ElCamino SS 52k survivor '87 Grand National 41k True 2nd to last built in 1987. '86 K30 454 SRW fleetside CA since new '88 Trans Am GTA 39k bought new 2018 DEMON plum crazy @ 840HP! "Need for speed"

12-23-2004, 12:20 PM	#3
68305E Registered User Join Date: Dec 2004 Posts: 8	thanks, wow, that truck is darn cool. hope mine turns out that nice.

12-23-2004, 01:03 PM	#5
68305E Registered User Join Date: Dec 2004 Posts: 8	Thank you thank you thank you...I found a guy who is about 25 miles from me who makes the conversion kit wow. ALl this in less than 30 minites. You gotta love the internet. Here I was sweatin bullets. http://www.transmissionadapters.com/ there is also a lot of good stuff on performance upgrades. Thanks again. Now I just gotta figure out the power steering.

12-23-2004, 01:31 PM	#7
68305E Registered User Join Date: Dec 2004 Posts: 8	I would like it all but I am told that 4x4 and 2wd stuff does not interchange. Not sure the trans would work cause i need a short shaft to bolt up to the T-Case. I will keep this in mind. Thank you very much for the info.. Jake



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