New Rear End Gears - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BLE 'BURBAN · 07-20-2015, 01:54 AM

Taking Big Red ('87 R3500 Crew Cab Dually 454 TBI TH400) into Young's Gear tomorrow to get new gears put in the rear axle.
Out with the O.E.M. 4:10's (gas mileage around 7.5 in town & 11 highway)
And in with 3:54 gears from DANA/SPICER CORP.
Also installing a GEAR VENDOR'S OVERDRIVE UNIT that'll drop the final drive to 2:77 when engaged. I'll be taking it for a nice long drive to Soldotna, Alaska this next weekend. I'll report back on the gas mileage & performance when I get back home.

Blessed66 · 07-20-2015, 12:33 PM

You can never go wrong with overdrive. Keep us posted! The TH200-4R swap into my other truck made a world of difference for Interstate driving.

Jake Wade · 07-20-2015, 05:25 PM

Wow! Big $ Gears, gear vendor, and shorten driveshaft. Makes a very nice combo though.

78trk · 07-20-2015, 08:21 PM

I have 410 gears with 32 inch tires and a gear vendor. I wouldn't want higher gears in rear end.
I would put in gear vendor first and see how you like gearing.

BLE 'BURBAN · 08-04-2015, 03:30 AM

Got the truck back on the 24th. Took it out for a shakedown run the next day to Soldotna, Ak. Had a bunch of stop and go traffic all the way there (about 280 miles) averaged 11.5 m.p.g. all the way there. On the way back though it was smooth sailing all the way home with the cruise set at 68 and actually got even better gas mileage of 14.5 MPG!!!

Went from LT215/85R16 tires, 4:10 rear end gears and 454/TH400 getting 7.5mpg to 3.54 gears and a gearvendors overdrive unit almost doubled my highway mileage. around town I'm only getting about 8-10 depending on how heavy my foot is.

77 Big 10 · 08-04-2015, 11:33 AM

Nice numbers on your trip, I like my gear vendor too. Is yours the under/over drive?

RIDE-RED 350r · 08-04-2015, 05:02 PM

Nice to see some results and a happy customer after investing some coin in his rig...

I just found out about Gear Vendors splitter/OD unit and want one for my sm465 in the worst way!

TwoFiftyShifter · 08-04-2015, 08:14 PM

Impressive MPG.

BLE 'BURBAN · 08-05-2015, 01:11 AM

Quote:

Originally Posted by 77 Big 10

Nice numbers on your trip, I like my gear vendor too. Is yours the under/over drive?

Yeppers it is.

77 Big 10 · 08-05-2015, 11:22 AM

Cool, those six forward speeds sure take a lot of load off the engine.

bmchevy1979 · 08-05-2015, 08:58 PM

Quote:

Originally Posted by RIDE-RED 350r

Nice to see some results and a happy customer after investing some coin in his rig...

I just found out about Gear Vendors splitter/OD unit and want one for my sm465 in the worst way!

Is your truck 2wd or 4x4 because it would probably be cheaper or about the same to switch to a nv4500

RIDE-RED 350r · 08-05-2015, 09:24 PM

Quote:

Originally Posted by bmchevy1979

Is your truck 2wd or 4x4 because it would probably be cheaper or about the same to switch to a nv4500

She's a K-10.

bmchevy1979 · 08-05-2015, 09:50 PM

RED RIDE 350r
Adapter
Http://www.advanceadapters.com/produ...spline-nv4500/
And Trans
Http://www.advanceadapters.com/produ...transmissions/

07-20-2015, 01:54 AM	#1
BLE 'BURBAN In the Forgotten far North. Join Date: Jul 2007 Location: Anchorage, Alaska Posts: 2,627	New Rear End Gears Taking Big Red ('87 R3500 Crew Cab Dually 454 TBI TH400) into Young's Gear tomorrow to get new gears put in the rear axle. Out with the O.E.M. 4:10's (gas mileage around 7.5 in town & 11 highway) And in with 3:54 gears from DANA/SPICER CORP. Also installing a GEAR VENDOR'S OVERDRIVE UNIT that'll drop the final drive to 2:77 when engaged. I'll be taking it for a nice long drive to Soldotna, Alaska this next weekend. I'll report back on the gas mileage & performance when I get back home. __________________ 1987 R3500 CREW CAB DUALLY (BIG RED)Acquired 06/12/2015 1990 chevy suburban V2500 5.7L My cluster Mods-Nov 2007 overhead console Stereo install Round 2 Aug 2009 Heated/turn signal mirror upgrade

07-20-2015, 12:33 PM	#2
Blessed66 Registered User Join Date: Oct 2012 Location: Tyler, Texas Posts: 217	Re: New Rear End Gears You can never go wrong with overdrive. Keep us posted! The TH200-4R swap into my other truck made a world of difference for Interstate driving. __________________ Current Projects: 1984 GMC, LWB Fleetside, 305/350 - Currently Doing TBI Conversion 1966 GMC, SWB Stepside, 350/200-4R - Currently waiting patiently.

07-20-2015, 05:25 PM	#3
Jake Wade Registered User Join Date: Aug 2005 Location: Louisiana Posts: 711	Re: New Rear End Gears Wow! Big $ Gears, gear vendor, and shorten driveshaft. Makes a very nice combo though.

07-20-2015, 08:21 PM	#4
78trk Registered User Join Date: Aug 2012 Location: lakeside california Posts: 18	Re: New Rear End Gears I have 410 gears with 32 inch tires and a gear vendor. I wouldn't want higher gears in rear end. I would put in gear vendor first and see how you like gearing.

08-04-2015, 03:30 AM	#5
BLE 'BURBAN In the Forgotten far North. Join Date: Jul 2007 Location: Anchorage, Alaska Posts: 2,627	Re: New Rear End Gears Got the truck back on the 24th. Took it out for a shakedown run the next day to Soldotna, Ak. Had a bunch of stop and go traffic all the way there (about 280 miles) averaged 11.5 m.p.g. all the way there. On the way back though it was smooth sailing all the way home with the cruise set at 68 and actually got even better gas mileage of 14.5 MPG!!! Went from LT215/85R16 tires, 4:10 rear end gears and 454/TH400 getting 7.5mpg to 3.54 gears and a gearvendors overdrive unit almost doubled my highway mileage. around town I'm only getting about 8-10 depending on how heavy my foot is. __________________ 1987 R3500 CREW CAB DUALLY (BIG RED)Acquired 06/12/2015 1990 chevy suburban V2500 5.7L My cluster Mods-Nov 2007 overhead console Stereo install Round 2 Aug 2009 Heated/turn signal mirror upgrade

08-04-2015, 11:33 AM	#6
77 Big 10 Registered User Join Date: Jul 2015 Location: La Quinta, CA. Posts: 131	Re: New Rear End Gears Nice numbers on your trip, I like my gear vendor too. Is yours the under/over drive?

08-04-2015, 05:02 PM	#7
RIDE-RED 350r Registered User Join Date: Mar 2014 Location: Blossvale NY Posts: 202	Re: New Rear End Gears Nice to see some results and a happy customer after investing some coin in his rig... I just found out about Gear Vendors splitter/OD unit and want one for my sm465 in the worst way! __________________ Who needs a Hemi when ya got a Chevy!

08-04-2015, 08:14 PM	#8
TwoFiftyShifter Registered User Join Date: Nov 2008 Location: Gwinnett GA Posts: 1,803	Re: New Rear End Gears Impressive MPG. __________________ 1982 K10 SWB 1987 V20 - Sold - Doh!

08-05-2015, 11:22 AM	#10
77 Big 10 Registered User Join Date: Jul 2015 Location: La Quinta, CA. Posts: 131	Re: New Rear End Gears Cool, those six forward speeds sure take a lot of load off the engine.

08-05-2015, 09:50 PM	#13
bmchevy1979 Registered User Join Date: Dec 2010 Location: Visalia, Ca Posts: 707	Re: New Rear End Gears RED RIDE 350r Adapter Http://www.advanceadapters.com/produ...spline-nv4500/ And Trans Http://www.advanceadapters.com/produ...transmissions/ __________________ <Brandon> 1974 Chevrolet K5 Blazer 350sbc/SM465/NP205, dana44 front, corp 14bolt rear with 4.10s and a powertrax locker, custom rear bumper 400sbc in the works. 1981 GMC C1500 stepside 250i6, 3spd, 12bolt with 3.08s 2.5/4drop on 15x10 with 275/50r15 81 GMC C3500 cab-chassis dually with utility bed 350sbc, Sm465, 14bolt with 4.10s nv4500 getting ready to go in 1979 Chevrolet K5 R.I.P. http://67-72chevytrucks.com/vboard/s...d.php?t=434096 1976 Chevrolet C10 R.I.P. http://67-72chevytrucks.com/vboard/s...d.php?t=434195



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