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02-24-2015, 02:25 PM
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#1 |
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Registered User
Join Date: Feb 2015
Location: Phoenix
Posts: 13
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1987 GMC R3500 dually with th400
I have 1987 GMC R3500 dually with th400 I was wondering what upgrade I can do with th400 for hauling towing
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02-24-2015, 04:06 PM
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#2 |
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Registered User
Join Date: Sep 2014
Location: Texas
Posts: 215
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Re: 1987 GMC R3500 dually with th400
I used a B&M Traveler torque converter designed for towing and a 34 element sprag and a deeper pan with cooling tubes for mine along with a complete overhaul. I know there is more you can do but this is what my budget allowed. Look at mikestransmission.com and other simular sites to get more ideas. My 1987 Cab and Chassis already had the heavy duty transmission case. I ended up parking the truck after about 20,000 miles due to engine problems and not needing a heavy hauler anymore.
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02-24-2015, 04:42 PM
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#3 |
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Registered User
Join Date: Aug 2012
Location: Northeast KS
Posts: 1,789
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Re: 1987 GMC R3500 dually with th400
new fluid, and a good tranny cooler. th400 are pretty tough.
__________________
1999 GMC Suburban K2500 SLT, 454/4L80E 1991 Z/28, 6.0L/T56 1949 GMC 250, S10 Frame, 6.0L/4L80E Instagram @aceshighspeedshop |
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02-24-2015, 05:06 PM
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#4 |
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Registered User
 Join Date: Nov 2013
Location: Fowler California
Posts: 140
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Re: 1987 GMC R3500 dually with th400
x2 tranny cooler. These transmissions are pretty tough as is. Just keep it from getting too hot and it'll be happy.
__________________
1967 CHEVELLE MALIBU 427/700R4 1971 CHEYENNE 10 350/350 1983 GMC K3500 454/400/205 1987 R10 TBI 350/700R4 2014 CRUZE 2.0 TURBO DIESEL |
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02-24-2015, 06:11 PM
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#5 |
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Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,071
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Re: 1987 GMC R3500 dually with th400
Beyond a fluid change + fresh filter, a trans cooler & shift kit are good investments.
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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02-26-2015, 03:36 PM
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#6 |
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Registered User
Join Date: Dec 2013
Location: Columbus, Oh
Posts: 367
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Re: 1987 GMC R3500 dually with th400
If you are going to keep the truck and want better mileage update it to a 4L80E transmission with overdrive and a lock up torque converter. If you spend any money on the TH400 other than a shift kit and filter change you would be much better off spending the money on the 4L80E swap. Transmission cooler and cooling pan are good ideas for any Heavy duty transmission.
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