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09-09-2018, 12:07 AM
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#1 |
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Registered User
Join Date: Dec 2009
Location: bisbee, arizona
Posts: 1,529
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77k10 with a bad th350
Looking at my first; nice 77K10 Long fleet 350/350. the tranny is bad dont know what than means. less than 100 K on the truck. origonal owner. az rust free. 1500$.
my question is: would it be worth it to rebuild the th350 or put an auto od in it. Or Go with a np4500 I'm leaning towards rebuilding the 350 I would have it rebuilt professionally. opinions |
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09-09-2018, 01:42 AM
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#2 |
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78 Big10 454
 
Join Date: Jul 2008
Location: Pismo Beach, CA
Posts: 838
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Re: 77k10 with a bad th350
Personally, I'd have the TH-350 professionally rebuilt. A quality tranny shop can rebuild it in a day for a reasonable amount of $$$.
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1978 Chevy SWB C-10 2WD 454/400 |
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09-09-2018, 09:27 AM
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#3 |
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Senior Member
Join Date: Dec 2009
Location: TN.
Posts: 7,723
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Re: 77k10 with a bad th350
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________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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09-09-2018, 11:35 AM
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#4 |
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Registered User
Join Date: Dec 2013
Location: Columbus, Oh
Posts: 366
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Re: 77k10 with a bad th350
Changing it to an overdrive would require moving the transfer case and changing both driveshaft lengths. Mileage would improve as well as less engine wear, But it would take a long time to recoup the investment.
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09-09-2018, 07:13 PM
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#5 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,260
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Re: 77k10 with a bad th350
what are your plans for the truck? to me that would dictate what kind of upgrades to do with it, if any
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Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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09-09-2018, 10:24 PM
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#6 |
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Registered User
Join Date: Mar 2010
Location: thomastown mississippi
Posts: 1,261
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Re: 77k10 with a bad th350
Do an oil psi check on the trans & see if it is really something inside or just the torque converter gone bad.
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09-09-2018, 10:53 PM
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#7 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,477
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Re: 77k10 with a bad th350
Tire size and diff gear ratio? Depending on those, an overdrive may wind up with too low an engine RPM in OD and actually hurt mileage.
If you have the TH350 rebuilt, might have the shop check over the transfer case while you are at it. |
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09-13-2018, 09:51 PM
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#8 |
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Registered User
Join Date: Dec 2009
Location: bisbee, arizona
Posts: 1,529
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Re: 77k10 with a bad th350
check the transfer case for what exactly. dont know the 205's my 68k20 has a 221
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09-14-2018, 07:32 AM
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#9 |
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Registered User
Join Date: Oct 2013
Location: Maine
Posts: 2,334
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Re: 77k10 with a bad th350
I never rebuild anything until it dies first. My 76 K10 has 185k miles on the original drivetrain and I still drive it down the interstate.
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76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10 |
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