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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 09-25-2008, 07:35 PM   #1 (permalink)
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Smile zf won't go in reverse

Hello ya'll 1st time on site I have a '93 f250 4x4 7.3 zf-5 4.10's If rolling forward , or stopped aimed downhill will not go in rev. if it aims up or bump against curb etc. goes right in no grind temp/drive time not differance ,only had about a mo. 300,000+mi. I was told. Any help would be appreciated Thanx!
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Old 09-25-2008, 09:20 PM   #2 (permalink)
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If the clutch has 300k+ miles, it may be worn out...
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Old 09-25-2008, 11:43 PM   #3 (permalink)
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have thought about that , no issues in forward gears though , I do have cl/brk bushing set just not installed yet lot of slack in linkage ,crossing fingers on that ,just did'nt know if this is a common problem (rev.)or not Thank You.
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Old 09-25-2008, 11:54 PM   #4 (permalink)
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Check the firewall for cracks and flexing around the booster etc. If the pedal bushings/linkages are worn that will cause some problems.

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Old 09-26-2008, 02:39 AM   #5 (permalink)
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tak'n a guess probably need extra set of eyes to check flex?Thanks.
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Old 09-26-2008, 05:28 PM   #6 (permalink)
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You may have air in the hydraulic system due to a faulty slave or master cylinder, and if the clutch is worn it aggravates the problem even further.
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Old 09-29-2008, 05:23 PM   #7 (permalink)
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You may have air in the hydraulic system due to a faulty slave or master cylinder, and if the clutch is worn it aggravates the problem even further.
Sorry about reply time, no external fluid, hauled aload of green wood no problem,but will look closer thanx.
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Old 10-03-2008, 08:21 PM   #8 (permalink)
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Can't be air 'cuz theres no problem in the forward gears. Mine was really hard to get into rev. it would always pop out and grind. put a new clutch, flywheel and throwout bearing works great!
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Old 10-03-2008, 11:00 PM   #9 (permalink)
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I trick I just learned about ZF5s is to ditch the ATF from their case and fill 'em up with motor oil, 30W for time being, they can tolerate up to 50W. You need straight oil too, not 10W30 or something of that sort, just SAE 30 and if that don't elp SAE 50. Don't know why that works, but sometimes it does, so give it a shot.
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Old 10-04-2008, 08:50 AM   #10 (permalink)
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Try sliding the shifter to 5th but not in and then to reverse........ ford mech showed me this one the other day on a truck in the shop with same problem.
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Old 10-07-2008, 10:53 AM   #11 (permalink)
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I have found at times that if you let the clutch out just a bit as you try to put it into reverse it will slide right in.
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Old 10-07-2008, 11:17 AM   #12 (permalink)
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My manual for the 97 says you have to go to move the left of third and fourth before going into reverse.
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Old 10-10-2008, 07:55 PM   #13 (permalink)
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Well , I changed the clt/brk pedal bushings ,helped ALOT but will still grind & not go to rev. sometimes pumping clutch will help(after changing bushings) may have to plan on total clutch &assy. replace . Does it matter 30w. is detergent or non-detergent? Clutch will have to wait abit wonderful ex-wife can't wait to cost more money LOL!Thanx for info.
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Old 10-10-2008, 08:44 PM   #14 (permalink)
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sometimes pumping clutch will help....may have to plan on total clutch & assy. replace .
Sounds like you need a new master cyl and slave cyl assembly....about $215 at NAPA....pull the throwout arm and clean and grease it at the same time....
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Old 10-11-2008, 10:16 PM   #15 (permalink)
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Thanx for the info have to wait on payday to do anything else rite now but have a good plan to start on Thanx again everybody! let cha know asap.
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