1972 Jimmy - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Angelse68cal · 01-13-2014, 02:21 PM

Hey guys I am going to get back on working on my Jimmy.

I need some help with a few things

First off I have 35 inch swamppers need the correct gear ratio as I am going to need to change gearing from stock.

2nd. I have cross over steering I want to put on that has been sitting on my shelf for a couple years.

3rd I would like to put hydro assist and ideas or places who are more affordable than psc?

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. Here is what it looks like now.

Angelse68cal · 01-13-2014, 11:22 PM

Where are all my 4x4. Guru's. At?

DemkoG · 01-14-2014, 01:19 PM

1 What gear ratio do you want just back to like stock rpm or are you going to wheel and want that low end torque

3 for hydro boost brakes go to the junk yard and pull one off a Chevy one ton truck or van

Chulisohombre · 01-14-2014, 04:42 PM

What trans do you have? I have 35s and 4.10 with the sm465 and it is just about perfect. If you plan on putting in a overdrive trans later or don't run on the highway a lot 4.56 would be good.

Angelse68cal · 01-14-2014, 11:46 PM

I have a turbo 400...

I am gonna put ARB. OR ELOCKER ...not sure which set up yet

And I am not sure on 4:56 or 4:88

And the hydro assist I want for steering

Chulisohombre · 01-15-2014, 08:21 AM

With the th400 go with 4.56. There is a little slippage and parasitic power loss in that trans and the extra gearing will help. If you don't plan on bigger tires that ought to be perfect. 4.88 you'd be screaming down the highway st 3400 rpm at 60. At 60 with 4.10 I'm right around 24-2600 rpm. But I have the granny low gear so I can use a higher gear for highway and still be good offroad.

**special-K** · 01-18-2014, 09:34 AM

Do you plan on taller tires to fit the lift? I'd consider that before deciding on ratio. My rule of thumb with 35s is 410 with O/D and 4.56 w/o. A lot depends on engine torque,too,but with or without O/D and gears in the 4.10-4.56 range is what you want. Tell us about your engine

Angelse68cal · 01-18-2014, 12:09 PM

Engine is 383 Stroker. Turbo 400 trans , Np205 transfer case. Electric fans
Going to run a semi float 14 bolt in the rear mainly because of the 6 lug.
Dana 44 in the rear. 35 inch super swamper Tsl Sx. That's as big as I am gonna go on tire.

Not to sure if I am going to go with ARB OR E LOCKER.
Also I am going to buy hydro assist steering.

Angelse68cal · 01-25-2014, 03:12 PM

Ttt

YBNORML · 01-25-2014, 03:19 PM

I can't help you with your questions as I know nothing about 4X4's, but I really like your truck. It looks to be a real nice survivor.

01-13-2014, 02:21 PM	#1
Angelse68cal Cochino_Racing_909 Join Date: Oct 2006 Location: California Posts: 280	1972 Jimmy Hey guys I am going to get back on working on my Jimmy. I need some help with a few things First off I have 35 inch swamppers need the correct gear ratio as I am going to need to change gearing from stock. 2nd. I have cross over steering I want to put on that has been sitting on my shelf for a couple years. 3rd I would like to put hydro assist and ideas or places who are more affordable than psc? . Here is what it looks like now.

01-13-2014, 11:22 PM	#2
Angelse68cal Cochino_Racing_909 Join Date: Oct 2006 Location: California Posts: 280	Re: 1972 Jimmy Where are all my 4x4. Guru's. At?

01-14-2014, 01:19 PM	#3
DemkoG Registered User Join Date: Nov 2013 Location: Suffield CT Posts: 55	Re: 1972 Jimmy 1 What gear ratio do you want just back to like stock rpm or are you going to wheel and want that low end torque 3 for hydro boost brakes go to the junk yard and pull one off a Chevy one ton truck or van

01-14-2014, 04:42 PM	#4
Chulisohombre Registered User Join Date: Sep 2013 Location: Bangor pa Posts: 1,223	Re: 1972 Jimmy What trans do you have? I have 35s and 4.10 with the sm465 and it is just about perfect. If you plan on putting in a overdrive trans later or don't run on the highway a lot 4.56 would be good. __________________ 72 3/4 ton blazer. 5 inch lift on 35 inch tires. 355 corvette engine with crane roller rockers, rv cam, edelbrock carb and intake with one inch spacer. Thrush Headers with flowmaster 40 duels. 4speed sm465 manual. 4 wheel disk brakes with Inboarded rear shock prerunner style mounts and shocks.

01-14-2014, 11:46 PM	#5
Angelse68cal Cochino_Racing_909 Join Date: Oct 2006 Location: California Posts: 280	Re: 1972 Jimmy I have a turbo 400... I am gonna put ARB. OR ELOCKER ...not sure which set up yet And I am not sure on 4:56 or 4:88 And the hydro assist I want for steering

01-15-2014, 08:21 AM	#6
Chulisohombre Registered User Join Date: Sep 2013 Location: Bangor pa Posts: 1,223	Re: 1972 Jimmy With the th400 go with 4.56. There is a little slippage and parasitic power loss in that trans and the extra gearing will help. If you don't plan on bigger tires that ought to be perfect. 4.88 you'd be screaming down the highway st 3400 rpm at 60. At 60 with 4.10 I'm right around 24-2600 rpm. But I have the granny low gear so I can use a higher gear for highway and still be good offroad. __________________ 72 3/4 ton blazer. 5 inch lift on 35 inch tires. 355 corvette engine with crane roller rockers, rv cam, edelbrock carb and intake with one inch spacer. Thrush Headers with flowmaster 40 duels. 4speed sm465 manual. 4 wheel disk brakes with Inboarded rear shock prerunner style mounts and shocks.

01-18-2014, 09:34 AM	#7
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 1972 Jimmy Do you plan on taller tires to fit the lift? I'd consider that before deciding on ratio. My rule of thumb with 35s is 410 with O/D and 4.56 w/o. A lot depends on engine torque,too,but with or without O/D and gears in the 4.10-4.56 range is what you want. Tell us about your engine __________________ "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 ~

01-18-2014, 12:09 PM	#8
Angelse68cal Cochino_Racing_909 Join Date: Oct 2006 Location: California Posts: 280	Re: 1972 Jimmy Engine is 383 Stroker. Turbo 400 trans , Np205 transfer case. Electric fans Going to run a semi float 14 bolt in the rear mainly because of the 6 lug. Dana 44 in the rear. 35 inch super swamper Tsl Sx. That's as big as I am gonna go on tire. Not to sure if I am going to go with ARB OR E LOCKER. Also I am going to buy hydro assist steering.

01-25-2014, 03:12 PM	#9
Angelse68cal Cochino_Racing_909 Join Date: Oct 2006 Location: California Posts: 280	Re: 1972 Jimmy Ttt

01-25-2014, 03:19 PM	#10
YBNORML Registered User Join Date: May 2010 Location: Edmonton, Alberta Posts: 3,844	Re: 1972 Jimmy I can't help you with your questions as I know nothing about 4X4's, but I really like your truck. It looks to be a real nice survivor. __________________ --------------------------------------------------------------- Jason. 68’ GMC shortbox https://67-72chevytrucks.com/vboard/...d.php?t=794201 72' 2WD Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=425385 67' LongBox C-10 http://67-72chevytrucks.com/vboard/s...d.php?t=691845 InstaGram ybnorml67

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