Gear vendor's with 3:54 rear gears and th400? - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bbrriiaann1973 · 02-04-2018, 01:22 AM

I have a 70 c10 with a 383/700R4 3.73 lock rite posi and it's to sluggish While in overdrive. Liked the way it perfomed with the TH350.

**chewychevy67** · 03-03-2018, 12:22 AM

I'm wondering if I could get them to program the computer to get the Overdrive to shift in at 52-55 mph instead of 47 mph. Would that help this setup? It would keep the rpms higher into the shift. I could easily change the rear to 3.73 but my diff has new gears in it now and it's nice and clean. If I'm changing Maby 4.10 gears could be a possability if they will fit in the same case but that I'm not sure of.

**davischevy** · 03-03-2018, 12:40 AM

WE purchased a GV for the 454/400, 3.73 gears, 72 Suburban my son in law is building.

I'm anxious to see how it works.

bbrriiaann1973 · 03-08-2018, 08:53 AM

Cost?

**chewychevy67** · 03-08-2018, 09:23 AM

I don't want this to turn into a cost v's 700r4 thread guys. There are plenty of those. I will never put one in my trucks. I am simply wanting info on gear ratios and the gv Overdrive and pros and cons of adding one. Thanks.

jbarron · 03-08-2018, 10:13 AM

Ive got one behind a TH400 and 402BBC. But that is with 4:10 gears.
If I had 3:54s I would not add a GV, it would be too much reduction.
If your thinking about fuel economy it will never work out.
With the GV on you are driving another gear set and it becomes a wash.
With 4:10s on the highway running 4500rpm was a little much.
The GV reduced it closer to 3500 and I'm happy with that.

Run the 3:54s and if you don't like them swap them for something else.
I think you will be happy with them.
The cost of the drive shaft mods alone will just about pay for a new gear set.

**chewychevy67** · 03-08-2018, 10:24 AM

I am going to change my gears at this point I believe. I am going to add the gear vendors but you are correct 3.54 is too low. I'm building this truck to have fun in so fuel mileage isn't really a major concern. I like that I can get my rpms down and have it be a bit quieter in the cab and save my engine some wear on the highway. I'm just debating between 3.73, 3.92, or 4.10s. Would liven up the bottom end and give me a little on the top. My engine is an 275-300 hp 327 stock but will be rebuilt to same specs as stock.

02-04-2018, 01:22 AM	#1
bbrriiaann1973 Registered User Join Date: Jun 2015 Location: Phoenix Az Posts: 211	Re: Gear vendor's with 3:54 rear gears and th400? I have a 70 c10 with a 383/700R4 3.73 lock rite posi and it's to sluggish While in overdrive. Liked the way it perfomed with the TH350. __________________ Brian Ritter

03-03-2018, 12:22 AM	#2
chewychevy67 Senior Member Join Date: Jan 2010 Location: Here Posts: 5,576	Re: Gear vendor's with 3:54 rear gears and th400? I'm wondering if I could get them to program the computer to get the Overdrive to shift in at 52-55 mph instead of 47 mph. Would that help this setup? It would keep the rpms higher into the shift. I could easily change the rear to 3.73 but my diff has new gears in it now and it's nice and clean. If I'm changing Maby 4.10 gears could be a possability if they will fit in the same case but that I'm not sure of. Last edited by chewychevy67; 03-03-2018 at 12:55 AM.

03-03-2018, 12:40 AM	#3
davischevy Senior Member Join Date: Sep 2008 Location: Harrison, Arkansas Posts: 9,867	Re: Gear vendor's with 3:54 rear gears and th400? WE purchased a GV for the 454/400, 3.73 gears, 72 Suburban my son in law is building. I'm anxious to see how it works. __________________ other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless.

03-08-2018, 08:53 AM	#4
bbrriiaann1973 Registered User Join Date: Jun 2015 Location: Phoenix Az Posts: 211	Re: Gear vendor's with 3:54 rear gears and th400? Cost? __________________ Brian Ritter

03-08-2018, 09:23 AM	#5
chewychevy67 Senior Member Join Date: Jan 2010 Location: Here Posts: 5,576	Re: Gear vendor's with 3:54 rear gears and th400? I don't want this to turn into a cost v's 700r4 thread guys. There are plenty of those. I will never put one in my trucks. I am simply wanting info on gear ratios and the gv Overdrive and pros and cons of adding one. Thanks.

03-08-2018, 10:13 AM	#6
jbarron Registered User Join Date: Apr 2006 Location: Spring, Texas Posts: 167	Re: Gear vendor's with 3:54 rear gears and th400? Ive got one behind a TH400 and 402BBC. But that is with 4:10 gears. If I had 3:54s I would not add a GV, it would be too much reduction. If your thinking about fuel economy it will never work out. With the GV on you are driving another gear set and it becomes a wash. With 4:10s on the highway running 4500rpm was a little much. The GV reduced it closer to 3500 and I'm happy with that. Run the 3:54s and if you don't like them swap them for something else. I think you will be happy with them. The cost of the drive shaft mods alone will just about pay for a new gear set. __________________ '72 3/4 Cheyenne Super 402/TH400 Gear Vendors '72 3/4 Cheyenne Super 350/200R4 '50 1/2 Chevy 3 Window

03-08-2018, 10:24 AM	#7
chewychevy67 Senior Member Join Date: Jan 2010 Location: Here Posts: 5,576	Re: Gear vendor's with 3:54 rear gears and th400? I am going to change my gears at this point I believe. I am going to add the gear vendors but you are correct 3.54 is too low. I'm building this truck to have fun in so fuel mileage isn't really a major concern. I like that I can get my rpms down and have it be a bit quieter in the cab and save my engine some wear on the highway. I'm just debating between 3.73, 3.92, or 4.10s. Would liven up the bottom end and give me a little on the top. My engine is an 275-300 hp 327 stock but will be rebuilt to same specs as stock.

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.