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07-21-2015, 02:47 AM
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#1 |
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Registered User
Join Date: Feb 2014
Location: texas
Posts: 3
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89 4 speed questions
Just got a 89 k2500 4x4 with 6 lugs ??? It has a low geared 4 speed stick It shows L, 1, 2, 3, R, on the shift knob. It sounds like at 60 mph the motor is pushing like 3000 or 4000 rpm in the highest gear is this normal ?? I mean what is the "top safe" speed of this I dont want to blow anything up. If anyone has any info on this transmission any info would be great. Truck is in A++ Shape. New 350 new clutch
Thnaks, 
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07-21-2015, 01:00 PM
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#2 |
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driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,739
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Re: 89 4 speed questions
Its an SM465 and its final ratio is 1:1 just like any other non overdrive trans, or like 3rd gear in a 700r4/4L60/4L80 auto. Get a tach or figure out your rear end ratio to see what RPM your running.
__________________
-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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07-21-2015, 02:21 PM
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#3 |
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Post Whore
  
Join Date: May 2015
Location: Alabama
Posts: 14,662
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Re: 89 4 speed questions
My sm465 with a 30" tall tire and 4.10 rear gears would turn almost 3000 rpm at 65 mph.so I put in a 5spd and dropped it to around 2200 rpm at 65mph.. If you know all the info this is a quick way to find engine rpm............http://www.crawlpedia.com/rpm_gear_calculator.htm
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| 1989, 350, 4speed, 4x4, k2500 |
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