Best rear gears for 700r4 - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

HSRACER · 09-12-2013, 10:39 AM

I have one of each. A 3.73 and a 3.42. If you have a 3.73 in your truck your 700r will work well. If you are going to change the gear ratio I would recommend the 3.42 ratio. It is the best overall package!
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Tx Firefighter · 09-12-2013, 10:40 AM

Quote:

Originally Posted by LockDoc

-
So basically the only way to get 3.42's is to use the later, wider rear end and weld on new mounting pads?

LockDoc

New gear sets are a couple of hundred dollars. Summit carries a ton of options.
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HSRACER · 09-12-2013, 11:24 AM

Ćall Randy's ring and pinion. They can tell you what options each axle has. My guess is you can use what ever axle you currently have.
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KEL · 09-12-2013, 12:11 PM

Quote:

Originally Posted by BB72CHEVKT

Does it hurt a 700r4 to drive it in third gear and only manually shift to OD when necessary?

My question exactly !

HSRACER · 09-12-2013, 12:13 PM

No but it kind of defeats the purpose.
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motorcritter · 09-12-2013, 12:23 PM

If you're going to pull/haul anything heavy, running a 700R4/4L60 in 3rd (direct drive) is a good idea. Once you're on the roll, up shift to OD- kind of like a boat coming up on plane. If you're doing stop-n-go, up hills or extremely heavy loads, keep it in 3rd. Fuel mileage sucks, but it should be cheaper than a new transmission. Saw way too many in the trans shop, and it was brutal. If you're pulling heavy stuff, all the time, run a 4L80- they're made tough to play rough.
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slow-1 · 09-12-2013, 03:59 PM

Just be sure to lock the converter (I have a switch to manually lock the converter in 1st,2nd,or 3rd) if you stay in 3rd pulling or hauling anything heavy.

I often ride the back country roads in 3rd, I lock the converter and its just like a straight drive accellerating and slowing (engine braking).

**LockDoc** · 09-12-2013, 11:36 PM

Quote:

Originally Posted by Tx Firefighter

New gear sets are a couple of hundred dollars. Summit carries a ton of options.
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Thanks Kevin.... I checked with my local independent mechanic and he said it would run around $100 to install the gears. I'm not sure I want to invest $300 to put 3.42's in the Burb... I'm just a tight a$$ I guess...

LockDoc

**425HP409** · 09-13-2013, 12:30 AM

I have 3.73s in my 68 C10 and also in my 77 GMC Sprint with a built 454 and they both work great. About 2100 rpm at 70 mph..
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buddylj1990 · 09-13-2013, 12:37 AM

saginaw i now thats for 3 on tree what is saginaw mean

*Jdbfish* · 09-13-2013, 03:24 AM

Looks like 3:73 is the most common but 3:42 would be the ticket. How hard is it to change out the gears to get a 3:42? Anybody in the waco, temple, or Killeen area willing to advise and or demonstrate? Lol....
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71meangreenc10 · 09-13-2013, 03:45 AM

Quote:

Originally Posted by LockDoc

-
So basically the only way to get 3.42's is to use the later, wider rear end and weld on new mounting pads?

LockDoc

I use the 3.08 carrier and put in new gears. I have used Motive gears from Jegs and havent had any issues at all. I replace everything and set the backlash to Motives specs. Dont need a whole new axle.

Smitty

**special-K** · 09-13-2013, 08:29 AM

You can get 3.42s from a common and cheap (if not free) later rear. That's what I did,and my ring & pinion needed replaced anyway. If not for having no O/D for now,an possibly never,I'd run 3.73s or 4.10s just because I prefer gears with grunt and O/D allows that. I have two trucks,the ones I drive most,with 4.10s & O/D. The tires are tallish (both 4wds) and I can run along 75 mph all day no problem. For me,3.08s "is" O/D. It's too tall to go with O/D,IMO. 3.42 is the sweet spot for with or without O/D

*Jdbfish* · 09-15-2013, 10:30 PM

Found a 2004 chevy z71 with a 3:42 I can get the ring and pinion from, will it fit my rearend in the 70 model?
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09-12-2013, 10:39 AM	#26
HSRACER Registered User Join Date: Sep 2007 Location: Katy TX Posts: 1,268	Re: Best rear gears for 700r4 I have one of each. A 3.73 and a 3.42. If you have a 3.73 in your truck your 700r will work well. If you are going to change the gear ratio I would recommend the 3.42 ratio. It is the best overall package! Posted via Mobile Device __________________ HSRACER Slammed 53 5 window Blown/Bagged 54 Pickup Patinaed 67 LS stepside Supercharged 67 Nova Bagged 69 Suburban Turbo'ed 5.3 LS

09-12-2013, 11:24 AM	#28
HSRACER Registered User Join Date: Sep 2007 Location: Katy TX Posts: 1,268	Re: Best rear gears for 700r4 Ćall Randy's ring and pinion. They can tell you what options each axle has. My guess is you can use what ever axle you currently have. Posted via Mobile Device __________________ HSRACER Slammed 53 5 window Blown/Bagged 54 Pickup Patinaed 67 LS stepside Supercharged 67 Nova Bagged 69 Suburban Turbo'ed 5.3 LS

09-12-2013, 12:13 PM	#30
HSRACER Registered User Join Date: Sep 2007 Location: Katy TX Posts: 1,268	Re: Best rear gears for 700r4 No but it kind of defeats the purpose. Posted via Mobile Device __________________ HSRACER Slammed 53 5 window Blown/Bagged 54 Pickup Patinaed 67 LS stepside Supercharged 67 Nova Bagged 69 Suburban Turbo'ed 5.3 LS

09-12-2013, 12:23 PM	#31
motorcritter Registered User Join Date: Mar 2012 Location: Boulder, CO Posts: 350	Re: Best rear gears for 700r4 If you're going to pull/haul anything heavy, running a 700R4/4L60 in 3rd (direct drive) is a good idea. Once you're on the roll, up shift to OD- kind of like a boat coming up on plane. If you're doing stop-n-go, up hills or extremely heavy loads, keep it in 3rd. Fuel mileage sucks, but it should be cheaper than a new transmission. Saw way too many in the trans shop, and it was brutal. If you're pulling heavy stuff, all the time, run a 4L80- they're made tough to play rough. Posted via Mobile Device __________________ If 'that which does not kill me, makes me stronger', then I should be Superman by now!

09-12-2013, 03:59 PM	#32
slow-1 Registered User Join Date: May 2013 Location: Central NC Posts: 830	Re: Best rear gears for 700r4 Just be sure to lock the converter (I have a switch to manually lock the converter in 1st,2nd,or 3rd) if you stay in 3rd pulling or hauling anything heavy. I often ride the back country roads in 3rd, I lock the converter and its just like a straight drive accellerating and slowing (engine braking). __________________ 1972 Cheyene C-10 "Ole Green" My Grandfathers truck (early 70's to 1983) My first vehicle (1983) Original 350 (3 rebuilds) 700R4 from Bowtie Overdrives

09-13-2013, 12:30 AM	#34
425HP409 425hp409 Join Date: Oct 2008 Location: Prosper Texas Posts: 841	Re: Best rear gears for 700r4 I have 3.73s in my 68 C10 and also in my 77 GMC Sprint with a built 454 and they both work great. About 2100 rpm at 70 mph.. Posted via Mobile Device __________________ Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Olds 442, all original 90 ZR1 Corvette

09-13-2013, 12:37 AM	#35
buddylj1990 Registered User Join Date: Aug 2013 Location: waynesville georgia Posts: 164	Re: Best rear gears for 700r4 saginaw i now thats for 3 on tree what is saginaw mean

09-13-2013, 03:24 AM	#36
Jdbfish Account Suspended Join Date: Apr 2013 Location: Belton, tx Posts: 51	Re: Best rear gears for 700r4 Looks like 3:73 is the most common but 3:42 would be the ticket. How hard is it to change out the gears to get a 3:42? Anybody in the waco, temple, or Killeen area willing to advise and or demonstrate? Lol.... Posted via Mobile Device

09-13-2013, 08:29 AM	#38
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	Re: Best rear gears for 700r4 You can get 3.42s from a common and cheap (if not free) later rear. That's what I did,and my ring & pinion needed replaced anyway. If not for having no O/D for now,an possibly never,I'd run 3.73s or 4.10s just because I prefer gears with grunt and O/D allows that. I have two trucks,the ones I drive most,with 4.10s & O/D. The tires are tallish (both 4wds) and I can run along 75 mph all day no problem. For me,3.08s "is" O/D. It's too tall to go with O/D,IMO. 3.42 is the sweet spot for with or without O/D __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

09-15-2013, 10:30 PM	#39
Jdbfish Account Suspended Join Date: Apr 2013 Location: Belton, tx Posts: 51	Re: Best rear gears for 700r4 Found a 2004 chevy z71 with a 3:42 I can get the ring and pinion from, will it fit my rearend in the 70 model? Posted via Mobile Device



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