93 Cummins 3.54 Gears 60MPH Max Issue
Hey everyone Ive got a 75F250 4x4 with a 93 Cummins and a Diesel ZF5 Trans, I recently installed 3.54 gears because I was at max RPM at about 60. After installing the gears I haven't seen much difference in max speed just lower RPM through the first 4 gears. I don't understand why I cant go at least 75MPH? Help please!
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well, not sure if it will help tremendously but you might try changing the governor spring to the 366 spring.
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Thanks but I already installed the 366 Governor Spring...
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You might want to look at the throttle linkage. There's a pair of screws on either side that limit throttle travel. Mine had the one turned in so I was limited to 140 km/h. After turning it to get full travel I could do 150 something. Now with the spring I've pegged my speedometer a couple of times (180 km/h)
---AutoMerged DoublePost--- Either side of the pump that is |
What are your RPM's at top speed? If you have 33" tires 3:54 rear gear and and overdrive ratio of .72 like most ZF5 trans your top speed at 2500 RPM's is only going to be 96.33 MPH
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Thanks guys, the screw on my pump is unscrewed for max travel, This truck is running 35's with 3.54 gears and a ZF5 out of a 96 Powerstroke. I can rev to 3000RPM but still only max speed of maybe 65MPH. I thought my speedo was probably off so I used a GPS Speedo and the speedometer is dead on. Its really getting frustrating...:argh:
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Bad Clutch?
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Its got about 200 Miles on it...
---AutoMerged DoublePost--- The slave cylinder seems a little weak so I might change that and see what happens? |
Are you turning 3000RPM down the road under load or just holding WOT in the driveway. I may have said wrong about the 5th gear ratio it could be a 0.76 If so your top speed should be 116.15 MPH at 3000RPM. With the 3:54 rear gear and your tire size. If your clutch was slipping that bad you would have burnt it up by now.
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Cruising down the road hitting about 65 MAX running close to 3k. Like I said the clutch is brand new. I don't understand it.
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