need help with rear for tow rig.. off topic but you guys will know the answer - Competition Diesel.Com

rayjon · 02-05-2012, 07:24 PM

I have a 3500hd chevy 1995 with a 37 spline dana 80 in it, Did a cummins swap and working on a fuller 10 speed now, the problem I have is the 3.54 gear set I swapped into the dana 80 isn't working on the highway. I need 3.08 and something a little stronger if possible..

Here is my delema I have a small 10 lug pattern 7.5 not the metric pattern ford uses so a s110 is out.

Does anyone know of a rear that is bigger than a dana 80 comes in 3.08 and uses the old chevy mini 10 bolt pattern with Juice brakes..

I can also convert the brakes if ends are similar..

Thanks for the help

haloman · 02-05-2012, 07:33 PM

What size tires? Seems like that might be easier to change than rear ends.

2wpuller · 02-05-2012, 07:36 PM

Have the 10sp made in a OD I had my RT6610 made in a RTO6610
I had 3.54 also.

Dale

rayjon · 02-05-2012, 07:44 PM

the tires are 225/70/19.5 brand new all the way arround, cant really step up on the tire size due to the custom hauler bed i built and level of the truck now.. Its a crew cab built by monroe truck for a local city 18k gvw that I picked up second hand with 30k miles on the clock and a dead 6,5

the 10 speed will be an rto610 have a rt610 and am changing the gears to make it an rto

what I am trying to get to is under 2000 rpm running empty on the highway, Nevada is big and I have found with my other trucks if I keep the cummins under 2k I can get 20+ on the highway. that is the goal.. and with the 10 speed I will have all the gearing I will need, not to worried about breaking the dana 80 with only 350hp but would like to drop the rpm some more at 70mph.. I have the turbo and low end to pull the gear.. just trying to figure out how to get there with this combo.

thanks for the quick response..

2wpuller · 02-05-2012, 11:04 PM

How tall are the 19.5.I was running 2300 at 70mph with 29" 235/70/16 3.54 .80od.I got 25 empty.You will have the same OD as the RTO6610 once you switch over.With the allison 6sp I will be doing 1728rpm at 70mph when I get the truck back togetherOD in the allison is 5th.71:1 and 6th .62:1.My speedo was on the money with a GPS.So if your tires are taller than mine your RPM will be alittle less.

Dale

rayjon · 02-09-2012, 01:27 PM

the 19.5's are about 32" with the nv4500 I was at about 2100 at 70mph, the differnce isn't much but it should go up just a tad as the nv4500 is .75 and the rto is .80 in overdrive.. I will give it a while and run the 3.54 like you sugest and see what it does..

did find that the dana 135sl has ratios down to 2.61 and all I would have to do is swap the hubs off my 37 spline dana 80..

Charger · 02-09-2012, 01:30 PM

can the ten speed be made into a double overdrive

zstroken · 02-09-2012, 01:32 PM

I believe you can get a 3:31 gear for the 80. May not be enough for you though.

2wpuller · 02-09-2012, 06:51 PM

Quote:

Originally Posted by Charger

can the ten speed be made into a double overdrive

The RT6610 and the RT610 can not bemade into DOD.

Dale

02-05-2012, 07:24 PM	#1
rayjon Name: rayjon Title: Venimus, Vidimus, Deus vi Status: Not Here Join Date: May 2008 Location: Reno Nv. Member`s Gallery Posts: 112	need help with rear for tow rig.. off topic but you guys will know the answer I have a 3500hd chevy 1995 with a 37 spline dana 80 in it, Did a cummins swap and working on a fuller 10 speed now, the problem I have is the 3.54 gear set I swapped into the dana 80 isn't working on the highway. I need 3.08 and something a little stronger if possible.. Here is my delema I have a small 10 lug pattern 7.5 not the metric pattern ford uses so a s110 is out. Does anyone know of a rear that is bigger than a dana 80 comes in 3.08 and uses the old chevy mini 10 bolt pattern with Juice brakes.. I can also convert the brakes if ends are similar.. Thanks for the help

02-05-2012, 07:36 PM	#3
2wpuller Name: 2wpuller Title: letting the smoke fly Status: Not Here Join Date: Dec 2006 Location: Washington,Missouri Member`s Gallery Posts: 2,894	Have the 10sp made in a OD I had my RT6610 made in a RTO6610 I had 3.54 also. Dale __________________ 1975 f250 6.0 Perkins,twins,2006,6sp allison 1972 C10,5.9 5sp 2007 Dodge 2 WD pulling truck Sponsors GoerendTransmission Haisley Machine MCS MidwestPerformanceDiesel ShowMePerformance Snow Performance

02-05-2012, 07:44 PM	#4
rayjon Name: rayjon Title: Venimus, Vidimus, Deus vi Status: Not Here Join Date: May 2008 Location: Reno Nv. Member`s Gallery Posts: 112	the tires are 225/70/19.5 brand new all the way arround, cant really step up on the tire size due to the custom hauler bed i built and level of the truck now.. Its a crew cab built by monroe truck for a local city 18k gvw that I picked up second hand with 30k miles on the clock and a dead 6,5 the 10 speed will be an rto610 have a rt610 and am changing the gears to make it an rto what I am trying to get to is under 2000 rpm running empty on the highway, Nevada is big and I have found with my other trucks if I keep the cummins under 2k I can get 20+ on the highway. that is the goal.. and with the 10 speed I will have all the gearing I will need, not to worried about breaking the dana 80 with only 350hp but would like to drop the rpm some more at 70mph.. I have the turbo and low end to pull the gear.. just trying to figure out how to get there with this combo. thanks for the quick response.. Last edited by rayjon; 02-05-2012 at 07:49 PM.

02-05-2012, 11:04 PM	#5
2wpuller Name: 2wpuller Title: letting the smoke fly Status: Not Here Join Date: Dec 2006 Location: Washington,Missouri Member`s Gallery Posts: 2,894	How tall are the 19.5.I was running 2300 at 70mph with 29" 235/70/16 3.54 .80od.I got 25 empty.You will have the same OD as the RTO6610 once you switch over.With the allison 6sp I will be doing 1728rpm at 70mph when I get the truck back togetherOD in the allison is 5th.71:1 and 6th .62:1.My speedo was on the money with a GPS.So if your tires are taller than mine your RPM will be alittle less. Dale __________________ 1975 f250 6.0 Perkins,twins,2006,6sp allison 1972 C10,5.9 5sp 2007 Dodge 2 WD pulling truck Sponsors GoerendTransmission Haisley Machine MCS MidwestPerformanceDiesel ShowMePerformance Snow Performance

02-09-2012, 01:32 PM	#8
zstroken Name: zstroken Title: For $$$ your name here Status: Not Here Join Date: Sep 2006 Location: Western Michigan(by the lake) Member`s Gallery Posts: 23,151	I believe you can get a 3:31 gear for the 80. May not be enough for you though. __________________ 2008 4x4 Megacab, 68RFE 97 Dodge gone.... 24V P-Pump Mafia member #1(retired) Thanks to Mumau Diesel, Goerend Transmission, Northeast Diesel Service!

02-05-2012, 07:33 PM	#2
haloman Name: haloman Title: Too Much Time Status: Not Here Join Date: Aug 2007 Member`s Gallery Posts: 7,876	What size tires? Seems like that might be easier to change than rear ends.

02-09-2012, 01:27 PM	#6
rayjon Name: rayjon Title: Venimus, Vidimus, Deus vi Status: Not Here Join Date: May 2008 Location: Reno Nv. Member`s Gallery Posts: 112	the 19.5's are about 32" with the nv4500 I was at about 2100 at 70mph, the differnce isn't much but it should go up just a tad as the nv4500 is .75 and the rto is .80 in overdrive.. I will give it a while and run the 3.54 like you sugest and see what it does.. did find that the dana 135sl has ratios down to 2.61 and all I would have to do is swap the hubs off my 37 spline dana 80..

02-09-2012, 01:30 PM	#7
Charger Name: Charger Title: Too Much Time Status: Not Here Join Date: Nov 2010 Member`s Gallery Posts: 1,466	can the ten speed be made into a double overdrive