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07-20-2015, 01:54 AM
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#1 |
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In the Forgotten far North.
 
Join Date: Jul 2007
Location: Anchorage, Alaska
Posts: 2,627
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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.
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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 |
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07-20-2015, 12:33 PM
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#2 |
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Registered User
Join Date: Oct 2012
Location: Tyler, Texas
Posts: 217
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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.
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Current Projects: 1984 GMC, LWB Fleetside, 305/350 - Currently Doing TBI Conversion 1966 GMC, SWB Stepside, 350/200-4R - Currently waiting patiently. |
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07-20-2015, 05:25 PM
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#3 |
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Registered User
Join Date: Aug 2005
Location: Louisiana
Posts: 711
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Re: New Rear End Gears
Wow! Big $ Gears, gear vendor, and shorten driveshaft. Makes a very nice combo though.
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07-20-2015, 08:21 PM
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#4 |
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Registered User
Join Date: Aug 2012
Location: lakeside california
Posts: 18
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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. |
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08-04-2015, 03:30 AM
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#5 |
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In the Forgotten far North.
Join Date: Jul 2007
Location: Anchorage, Alaska
Posts: 2,627
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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 |
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08-04-2015, 11:33 AM
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#6 |
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Registered User
Join Date: Jul 2015
Location: La Quinta, CA.
Posts: 131
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Re: New Rear End Gears
Nice numbers on your trip, I like my gear vendor too. Is yours the under/over drive?
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08-04-2015, 05:02 PM
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#7 |
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Registered User
Join Date: Mar 2014
Location: Blossvale NY
Posts: 202
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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!
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Who needs a Hemi when ya got a Chevy! |
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08-04-2015, 08:14 PM
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#8 |
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Registered User
Join Date: Nov 2008
Location: Gwinnett GA
Posts: 1,803
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Re: New Rear End Gears
Impressive MPG.
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1982 K10 SWB 1987 V20 - Sold - Doh! |
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08-05-2015, 01:11 AM
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#9 | |
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In the Forgotten far North.
Join Date: Jul 2007
Location: Anchorage, Alaska
Posts: 2,627
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Re: New Rear End Gears
Quote:
__________________
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 |
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08-05-2015, 11:22 AM
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#10 |
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Registered User
Join Date: Jul 2015
Location: La Quinta, CA.
Posts: 131
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Re: New Rear End Gears
Cool, those six forward speeds sure take a lot of load off the engine.
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08-05-2015, 08:58 PM
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#11 | |
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Registered User
Join Date: Dec 2010
Location: Visalia, Ca
Posts: 707
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Re: New Rear End Gears
Quote:
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<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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08-05-2015, 09:24 PM
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#12 | |
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Registered User
Join Date: Mar 2014
Location: Blossvale NY
Posts: 202
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Re: New Rear End Gears
Quote:
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Who needs a Hemi when ya got a Chevy! |
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08-05-2015, 09:50 PM
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#13 |
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Registered User
Join Date: Dec 2010
Location: Visalia, Ca
Posts: 707
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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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