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05-03-2015, 09:19 PM
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#1 |
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Registered User
Join Date: Apr 2015
Location: N/a
Posts: 71
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No good on the freeway
Drove home the 79 today. 350 motor and trans, flow master exhaust. Speedo works but it is off. She wasn't screaming, but she also wasn't hauling ass.
No overdrive and have no idea what rear end gears she has. Any ideas to make the top end a bit better? Or where to start? |
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05-03-2015, 11:01 PM
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#2 |
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Registered User
Join Date: Jun 2011
Location: Central OR
Posts: 680
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Re: No good on the freeway
Gearing, taller tires, overdrive.
__________________
1955 GMC 250 8 Flatbed 1971 C30 157" 350 4spd 10' Flatbed 81 GMC K30 CnC 9' Flatbed 454 T400 89 GMC Jimmy Stock https://67-72chevytrucks.com/vboard/...d.php?t=810958 71 LT1 Convertible, 72 Coupe 69 CJ5, 75 CJ6, 67 M715, 72 M35A2 Bobbed, 95 XLC2 |
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05-03-2015, 11:44 PM
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#3 |
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Registered User
Join Date: Apr 2015
Location: N/a
Posts: 71
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Re: No good on the freeway
Can I add a shift kit in the trans to get an OD?
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05-04-2015, 04:25 AM
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#4 |
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Registered User
Join Date: Aug 2009
Location: S.C.
Posts: 1,593
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Re: No good on the freeway
No, shift kit will firm up what you have provided it's in decent shape.
__________________
'86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold  )I'm kinda like duct tape- no real purpose, but handy to have around. |
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05-04-2015, 11:34 AM
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#5 |
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Registered User
Join Date: Oct 2014
Location: Spearfish South Dakota
Posts: 407
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Re: No good on the freeway
The speed Limit was 55 when it was built. Tall tires are the cheapest way limited to how much say 300 rpm rear gears are next gears even 4 wheel drive you could cut rpm by a 1000 depending were its at now . Over drive trans and or overdrive unit cut them 25 % But cost is higher considerably higher. if your not a fair mechanic. Or and this is me it is what it is any time you swap things around it always cost way more than you figured. Just live with it unless your planning on putting a 100 miles a day on it.
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83 c10 long Box Daily Driver 90 Jimmy parked 98 Road King/ 06 Road Glide In memorium 63 impala SS/ 65 Chevy Panel 65 GMC Short Box/ 68 Camero |
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05-04-2015, 11:42 AM
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#6 | |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,177
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Re: No good on the freeway
Quote:
This would be an excellent time to pull the cover, replace the gear lube in the rear axle and count teeth on the ring and pinion. Report back and we can make further recommendations from there. Bigsteve's questions about usage and number of miles you will be driving are relevant and should be addressed. K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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05-04-2015, 01:33 PM
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#7 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,516
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Re: No good on the freeway
If you have a hand held GPS, most have a speedometer function. You can find out how off and which way off your speedometer is.
Does it have the original y-pipe? My 75 came with a double wall y. When the inner wall collapsed, it really screwed up the top end. |
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05-04-2015, 04:28 PM
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#8 |
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Registered User
Join Date: Mar 2014
Location: Blossvale NY
Posts: 202
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Re: No good on the freeway
Or if you have a smartphone, there are dozens of free GPS speedometer apps. And they seem to be quite accurate.
Can't disagree with any previous recommendations.
__________________
Who needs a Hemi when ya got a Chevy! |
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05-04-2015, 11:52 PM
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#9 |
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Registered User
Join Date: Apr 2015
Location: N/a
Posts: 71
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Re: No good on the freeway
It seems there a few other things that need to be done prior to rear axle upgrades. Took her for a spin today, started to misfire during acceleration. I looked around a little more and saw the passenger side muffler is sagging way further down than the driver side. Also it's all hung up there with bailing wire. The Painless wiring loom need to be finished up (none of the interior lights work and all the other gauges besides speedo aren't hooked up), windows and doors need new weather seals and there are a few other things too.
Need to get her road ready before I do anything else... |
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