Opinions on running 35s with tbi 454/th400? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Wellgeo03 · 04-12-2013, 12:19 PM

Looking at ordering a lift and some new tires for my new crew. I would like to run a set of 35s. It has 3.73 gears with a G80 in the rear.

It currently has the stock size 235s on it and the power is just OK. How badly will the 35s hurt the power?

I am currently torn between a 4" and a 6" lift for it. On my other crew, (86 custom deluxe) I figured a 4" would be fine to run 35s, as I am running 33s on it right now at stock height with no problems. This new crew (90 sliverado) sits almost exactly 1 inch lower than my 86 both front and rear even though both have the same GVW rating and spring count. The 86 is a 350/sm465, the 90 is the 454/th400.

What would you recommend?

Wellgeo03 · 04-12-2013, 08:25 PM

Has anyone run 35's with 3.73 gears and a 454?
Where is the peak torque of the TBI 454s?

dieseldawg142 · 04-13-2013, 12:02 AM

you would think a 454 should have no problems with 3:73's & 35's. my blazer had a 400sb, 3:73's, & 35's. was'ent a speed demon, but was'ent no slouch either. my crew (also 454,T400) has 38.5's with 4:56's, great off the line, but horrible on the freeway. i would stay with the 3:73's, if it drops your powerband too much, try 4:10's. would'nt go lower than that with the T400, kiss away any fuel mileage you think your getting!

Rubble · 04-13-2013, 01:12 AM

You should be fine with 35s & the 454.My 86 has 35s with a mild 350,465 & 4:10s Really good combo.Good off the line & not too bad for highway cruising...2500 rpm @ 100kms.
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b454rat · 04-13-2013, 09:02 AM

I ran a 454/400 with 40' boggers with 3.73s, and could still lite the tires up going around a corner....IMO it's a good compromise, what I love bout big blocks, lotsa torque!!!!!

Redcap · 04-13-2013, 02:29 PM

I'm running 35x12.5s on my K20 and 4.10 gears, which are a little too low for my 454 right now (I could pull a house down), but will be perfect once the Ranger OD goes in.

**Joesjunk** · 04-14-2013, 11:57 AM

I have a stock original 454/400 with 3:73 gears and 35's and it runs perfect.

Wellgeo03 · 04-14-2013, 12:25 PM

Great! Thanks for all the feed back guys!

I can't wait to get this new truck up in the air a bit and get some 35's under it!

Joesjunk, what are you running for a lift?
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**Joesjunk** · 04-14-2013, 01:00 PM

its a 4" lift

weider1717 · 04-14-2013, 02:14 PM

Quote:

Originally Posted by Joesjunk

I have a stock original 454/400 with 3:73 gears and 35's and it runs perfect.

Are you 100% sure thats just a 4" lift? looks like a 6" those 35's have plenty of room looks great!

**Joesjunk** · 04-14-2013, 03:11 PM

I thought it might be a 6" lift myself, but the springs have part #8002 rough country, I looked it up and it says 4"???? But I must say it pretty tall, taller than my 71 with a 4" lift and 35's
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b454rat · 04-14-2013, 09:29 PM

It's because 1 tons have a 2" taller frame than half and three quarters do.

**Joesjunk** · 04-14-2013, 10:07 PM

Quote:

Originally Posted by b454rat

It's because 1 tons have a 2" taller frame than half and three quarters do.

Thanks for that info!!
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04-12-2013, 12:19 PM	#1
Wellgeo03 Registered User Join Date: Jan 2011 Location: Maryfield, Saskatchewan Posts: 93	Opinions on running 35s with tbi 454/th400? Looking at ordering a lift and some new tires for my new crew. I would like to run a set of 35s. It has 3.73 gears with a G80 in the rear. It currently has the stock size 235s on it and the power is just OK. How badly will the 35s hurt the power? I am currently torn between a 4" and a 6" lift for it. On my other crew, (86 custom deluxe) I figured a 4" would be fine to run 35s, as I am running 33s on it right now at stock height with no problems. This new crew (90 sliverado) sits almost exactly 1 inch lower than my 86 both front and rear even though both have the same GVW rating and spring count. The 86 is a 350/sm465, the 90 is the 454/th400. What would you recommend? Attached Images

04-12-2013, 08:25 PM	#2
Wellgeo03 Registered User Join Date: Jan 2011 Location: Maryfield, Saskatchewan Posts: 93	Re: Opinions on running 35s with tbi 454/th400? Has anyone run 35's with 3.73 gears and a 454? Where is the peak torque of the TBI 454s?

04-13-2013, 12:02 AM	#3
dieseldawg142 Registered User Join Date: Jul 2011 Location: back 40, bc Posts: 3,914	Re: Opinions on running 35s with tbi 454/th400? you would think a 454 should have no problems with 3:73's & 35's. my blazer had a 400sb, 3:73's, & 35's. was'ent a speed demon, but was'ent no slouch either. my crew (also 454,T400) has 38.5's with 4:56's, great off the line, but horrible on the freeway. i would stay with the 3:73's, if it drops your powerband too much, try 4:10's. would'nt go lower than that with the T400, kiss away any fuel mileage you think your getting!

04-13-2013, 01:12 AM	#4
Rubble Registered User Join Date: Feb 2012 Location: Big Valley. Alberta Posts: 674	Re: Opinions on running 35s with tbi 454/th400? You should be fine with 35s & the 454.My 86 has 35s with a mild 350,465 & 4:10s Really good combo.Good off the line & not too bad for highway cruising...2500 rpm @ 100kms. Posted via Mobile Device __________________ 1977 Chev C30 454/465/14ff DRW 1974 Chev C20.350/465/14ff " Rock n Roll ain't noise pollution"

04-13-2013, 09:02 AM	#5
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,469	Re: Opinions on running 35s with tbi 454/th400? I ran a 454/400 with 40' boggers with 3.73s, and could still lite the tires up going around a corner....IMO it's a good compromise, what I love bout big blocks, lotsa torque!!!!! __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS Last edited by b454rat; 04-13-2013 at 09:27 AM.

04-13-2013, 02:29 PM	#6
Redcap Registered User Join Date: May 2010 Location: Lewis County, WA Posts: 1,523	Re: Opinions on running 35s with tbi 454/th400? I'm running 35x12.5s on my K20 and 4.10 gears, which are a little too low for my 454 right now (I could pull a house down), but will be perfect once the Ranger OD goes in. __________________ '77 K35 - 454, SM465/NP205, 4.56 D60/14bFF

04-14-2013, 11:57 AM	#7
Joesjunk Senior Member Join Date: May 2001 Location: Independence MO. Posts: 7,715	Re: Opinions on running 35s with tbi 454/th400? I have a stock original 454/400 with 3:73 gears and 35's and it runs perfect. Attached Images __________________ 72 3/4t Custom Deluxe 402/auto 66k Original paint 71 3/4t 4x4 Custom Deluxe 10k original miles Original paint 71 3/4t Cheyenne 402 70k original paint 72 3/4t 4x4 Custom deluxe 72 3/4t 4x4 Custom deluxe 91k original paint 72 Cheyenne/30 Dually 69 Camaro SS396 4-speed 13 GMC 2500HD Duramax I bought new 05 Jeep Wrangler "Willys Edition" 12k miles (I bought new) 85 3/4 ton 4x4 Scottsdale 33k miles original paint 86 1 ton 4x4 SRW Silverado 454 restored 80 1 ton 4x4 SRW Silverado 9,434 original miles!! original paint 95 GMC 1 ton dually 4x4 my dad bought new 95 GMC 3/4 ton 4x4, regular cab 454, 31k original miles 2002 2500HD 4x4 regular cab 6.0L 67k miles 2002 2500HD 4x4 regular cab 8.1L 28k miles 2003 GMC 2500HD 4x4 regular cab Diesel 93k miles 67-72 Parts for sale

04-14-2013, 12:25 PM	#8
Wellgeo03 Registered User Join Date: Jan 2011 Location: Maryfield, Saskatchewan Posts: 93	Re: Opinions on running 35s with tbi 454/th400? Great! Thanks for all the feed back guys! I can't wait to get this new truck up in the air a bit and get some 35's under it! Joesjunk, what are you running for a lift? Posted via Mobile Device

04-14-2013, 01:00 PM	#9
Joesjunk Senior Member Join Date: May 2001 Location: Independence MO. Posts: 7,715	Re: Opinions on running 35s with tbi 454/th400? its a 4" lift __________________ 72 3/4t Custom Deluxe 402/auto 66k Original paint 71 3/4t 4x4 Custom Deluxe 10k original miles Original paint 71 3/4t Cheyenne 402 70k original paint 72 3/4t 4x4 Custom deluxe 72 3/4t 4x4 Custom deluxe 91k original paint 72 Cheyenne/30 Dually 69 Camaro SS396 4-speed 13 GMC 2500HD Duramax I bought new 05 Jeep Wrangler "Willys Edition" 12k miles (I bought new) 85 3/4 ton 4x4 Scottsdale 33k miles original paint 86 1 ton 4x4 SRW Silverado 454 restored 80 1 ton 4x4 SRW Silverado 9,434 original miles!! original paint 95 GMC 1 ton dually 4x4 my dad bought new 95 GMC 3/4 ton 4x4, regular cab 454, 31k original miles 2002 2500HD 4x4 regular cab 6.0L 67k miles 2002 2500HD 4x4 regular cab 8.1L 28k miles 2003 GMC 2500HD 4x4 regular cab Diesel 93k miles 67-72 Parts for sale

04-14-2013, 03:11 PM	#11
Joesjunk Senior Member Join Date: May 2001 Location: Independence MO. Posts: 7,715	Re: Opinions on running 35s with tbi 454/th400? I thought it might be a 6" lift myself, but the springs have part #8002 rough country, I looked it up and it says 4"???? But I must say it pretty tall, taller than my 71 with a 4" lift and 35's Posted via Mobile Device __________________ 72 3/4t Custom Deluxe 402/auto 66k Original paint 71 3/4t 4x4 Custom Deluxe 10k original miles Original paint 71 3/4t Cheyenne 402 70k original paint 72 3/4t 4x4 Custom deluxe 72 3/4t 4x4 Custom deluxe 91k original paint 72 Cheyenne/30 Dually 69 Camaro SS396 4-speed 13 GMC 2500HD Duramax I bought new 05 Jeep Wrangler "Willys Edition" 12k miles (I bought new) 85 3/4 ton 4x4 Scottsdale 33k miles original paint 86 1 ton 4x4 SRW Silverado 454 restored 80 1 ton 4x4 SRW Silverado 9,434 original miles!! original paint 95 GMC 1 ton dually 4x4 my dad bought new 95 GMC 3/4 ton 4x4, regular cab 454, 31k original miles 2002 2500HD 4x4 regular cab 6.0L 67k miles 2002 2500HD 4x4 regular cab 8.1L 28k miles 2003 GMC 2500HD 4x4 regular cab Diesel 93k miles 67-72 Parts for sale

04-14-2013, 09:29 PM	#12
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,469	Re: Opinions on running 35s with tbi 454/th400? It's because 1 tons have a 2" taller frame than half and three quarters do. __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS



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