Overdrive - The 1947 - Present Chevrolet & GMC Truck Message Board Network

57Suburb · 05-02-2019, 01:39 PM

So in my quest to get overdrive in my manually shifted GMC, I've gone from putting an old school 3 speed with overdrive to now this. Couldn't find a correct replacement governor for the 3 speed, so found a Camaro version T5 for $200 with the intention of putting an S10 tailshaft on it, until I stumbled across this nifty little add-on.

**LockDoc** · 05-02-2019, 08:58 PM

-
It will be interesting to see how that works when it's on the road. Keep us posted. It looks like a mechanical marvel.....

LockDoc

lutronjim · 05-02-2019, 09:43 PM

Who sells this?

**jocko** · 05-02-2019, 11:25 PM

Ok, I responded - THEN I re-read your post, noticing the funky contraption on your tailshaft/shifter - somehow I missed the whole point of your post the first time around, ha. Do tell, where DID you find that gizmo??

57Suburb · 05-03-2019, 08:41 AM

Quote:

Originally Posted by lutronjim

Who sells this?

It’s a tremec item. They made them for a Euro version of the T5. With a couple easy mods, I was able to adapt it to the Camaro version. Puts the shifter really close to where the sm465 would come through the floor.

Thegearbox.org

terry b · 05-03-2019, 09:47 AM

I like it!!

jcramsey · 05-03-2019, 12:52 PM

Thats a cool piece!

da.slyboy · 05-03-2019, 02:10 PM

Wow, was just looking to take on the T5 project. You will have to let us know if there are space issues in the tunnel.

57Suburb · 06-10-2019, 11:57 AM

It's in. Need to fab up a crossmember because I ended up having to remove the original bellhousing mount style. It's tight, but works like it should.

da.slyboy · 06-10-2019, 12:52 PM

Awesome, thanks for the update. Now it's making me want to complete this project

Is your truck a low hump tunnel?

57Suburb · 06-10-2019, 01:27 PM

Quote:

Originally Posted by da.slyboy

Awesome, thanks for the update. Now it's making me want to complete this project

Is your truck a low hump tunnel?

Yes, low hump.

old51sedan · 06-10-2019, 07:56 PM

That T-5 looks like it will work sweet with your 250. I have a truck with the 250/3 speed auto. I'm currently about where your at except I'm install ing a 292 with a 200-R4 automatic overdrive. My truck has the 373 gears, yours probably does also. I see your also adding Air, looks like the same as mine. Do you know as to wether or not you are going to need a 3 grove harmonic balancer for the air conditioning? Hope everything works out for you.

57Suburb · 06-11-2019, 09:05 AM

Quote:

Originally Posted by old51sedan

That T-5 looks like it will work sweet with your 250. I have a truck with the 250/3 speed auto. I'm currently about where your at except I'm install ing a 292 with a 200-R4 automatic overdrive. My truck has the 373 gears, yours probably does also. I see your also adding Air, looks like the same as mine. Do you know as to wether or not you are going to need a 3 grove harmonic balancer for the air conditioning? Hope everything works out for you.

My truck doesn't have power steering, so a 2 groove pulley is going to work for me.

old51sedan · 06-11-2019, 09:33 AM

I guess if I had looked at the gear box, I would have know that. Love the intake you have, are you going to use a 4 barrel or adapt it to a 2 barrel?

57Suburb · 06-11-2019, 09:35 AM

Quote:

Originally Posted by old51sedan

I guess if I had looked at the gear box, I would have know that. Love the intake you have, are you going to use a 4 barrel or adapt it to a 2 barrel?

I'm going with a FiTech EFI. Going to try for some good gas mileage out of the old girl. LOL

05-02-2019, 01:39 PM	#1
57Suburb Registered User Join Date: Apr 2014 Location: Southern Iowa Posts: 310	Overdrive So in my quest to get overdrive in my manually shifted GMC, I've gone from putting an old school 3 speed with overdrive to now this. Couldn't find a correct replacement governor for the 3 speed, so found a Camaro version T5 for $200 with the intention of putting an S10 tailshaft on it, until I stumbled across this nifty little add-on. Attached Images __________________ 1972 C30 Grain Hauler, 350/400 1967 1500 GMC Stepside SWB, In Transformation Process 1967 RS/SS Camaro 350/TKO600

05-02-2019, 08:58 PM	#2
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,771	Re: Overdrive - It will be interesting to see how that works when it's on the road. Keep us posted. It looks like a mechanical marvel..... LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

05-02-2019, 09:43 PM	#3
lutronjim Registered User Join Date: Dec 2013 Location: Dunwoody,Ga Posts: 443	Re: Overdrive Who sells this?

05-02-2019, 11:25 PM	#4
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,975	Re: Overdrive Ok, I responded - THEN I re-read your post, noticing the funky contraption on your tailshaft/shifter - somehow I missed the whole point of your post the first time around, ha. Do tell, where DID you find that gizmo??

05-03-2019, 09:47 AM	#6
terry b Registered User Join Date: Oct 2011 Location: jackson michigan Posts: 755	Re: Overdrive I like it!!

05-03-2019, 12:52 PM	#7
jcramsey Registered User Join Date: Jun 2011 Location: Marion, NC Posts: 851	Re: Overdrive Thats a cool piece! __________________ The Egg Hauler The Government Mule

05-03-2019, 02:10 PM	#8
da.slyboy Registered User Join Date: May 2013 Location: Wichita, KS Posts: 14	Re: Overdrive Wow, was just looking to take on the T5 project. You will have to let us know if there are space issues in the tunnel.

06-10-2019, 11:57 AM	#9
57Suburb Registered User Join Date: Apr 2014 Location: Southern Iowa Posts: 310	Re: Overdrive It's in. Need to fab up a crossmember because I ended up having to remove the original bellhousing mount style. It's tight, but works like it should. Attached Images __________________ 1972 C30 Grain Hauler, 350/400 1967 1500 GMC Stepside SWB, In Transformation Process 1967 RS/SS Camaro 350/TKO600

06-10-2019, 12:52 PM	#10
da.slyboy Registered User Join Date: May 2013 Location: Wichita, KS Posts: 14	Re: Overdrive Awesome, thanks for the update. Now it's making me want to complete this project Is your truck a low hump tunnel?

06-10-2019, 07:56 PM	#12
old51sedan Registered User Join Date: Oct 2015 Location: Williamston, Mi Posts: 884	Re: Overdrive That T-5 looks like it will work sweet with your 250. I have a truck with the 250/3 speed auto. I'm currently about where your at except I'm install ing a 292 with a 200-R4 automatic overdrive. My truck has the 373 gears, yours probably does also. I see your also adding Air, looks like the same as mine. Do you know as to wether or not you are going to need a 3 grove harmonic balancer for the air conditioning? Hope everything works out for you.

06-11-2019, 09:33 AM	#14
old51sedan Registered User Join Date: Oct 2015 Location: Williamston, Mi Posts: 884	Re: Overdrive I guess if I had looked at the gear box, I would have know that. Love the intake you have, are you going to use a 4 barrel or adapt it to a 2 barrel?

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