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#1
02-15-2009, 05:24 PM
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speedo question
When I change my trans I will be putting my original 3.07 rear back in my coupe. The speedo was off before but I would like to have it correct. I have a 120 MPH speedo right now of unknown origin. It is off by around 15%. I think the original speedo was most likely a 85 mph speedo, which will not do with the 5 speed. Is there a 120 MPH speedo from a 3.07 car that I could use in my coupe to keep it 120 and make it accurate
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 1982 300CD Turbo (Otis, "ups & downs") parts for sale 2003 TJ with Hemi (to go anywhere, quickly) sold 2001 Excursion Powerstroke (to go dependably) 1970 Mustang 428SCJ (to go fast) 1962 Corvette LS1 (to go in style) 2001 Schwinn Grape Krate 10spd (if all else fails) 
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#2
02-15-2009, 06:03 PM
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looks like W116 300SD has 3.07, and W116 450SE, SEL have 3.06. W107 450SL,SLC have 3.06, Anyone know if these are mechanical and what the MPH reads on them?
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1982 300CD Turbo (Otis, "ups & downs") parts for sale 2003 TJ with Hemi (to go anywhere, quickly) sold 2001 Excursion Powerstroke (to go dependably) 1970 Mustang 428SCJ (to go fast) 1962 Corvette LS1 (to go in style) 2001 Schwinn Grape Krate 10spd (if all else fails)
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#3
02-15-2009, 09:38 PM
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IIRC, a speedo from either an '83 or '84 had higher mph readings, and has the 3.07 gearing.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#4
02-15-2009, 10:07 PM
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Quote:
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1982 300CD Turbo (Otis, "ups & downs") parts for sale 2003 TJ with Hemi (to go anywhere, quickly) sold 2001 Excursion Powerstroke (to go dependably) 1970 Mustang 428SCJ (to go fast) 1962 Corvette LS1 (to go in style) 2001 Schwinn Grape Krate 10spd (if all else fails)
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#5
02-15-2009, 10:28 PM
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Check the part number on the face of the speedo. The one from 85 is: 123 542 27 57.
My '82 has the 85 mph speedo, so I do not know what the part number would be for 83 or 84.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#6
02-16-2009, 06:38 AM
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you can also tell by the speed of the hash marks. see what third gear max speed is and post it and we'll tell you what gear ratio its from.....if it came from a diesel.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#7
02-16-2009, 08:13 AM
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Quote:
part number on the speedo face is 123 542 2857 hash marks are 28, 43, 73 MPH
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1982 300CD Turbo (Otis, "ups & downs") parts for sale 2003 TJ with Hemi (to go anywhere, quickly) sold 2001 Excursion Powerstroke (to go dependably) 1970 Mustang 428SCJ (to go fast) 1962 Corvette LS1 (to go in style) 2001 Schwinn Grape Krate 10spd (if all else fails)
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