Slam or Clunk in Reverse

Clutch, transmission, rear axle

Moderators: FORDification, 70_F100

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massillon preacher
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Slam or Clunk in Reverse

Post by massillon preacher »

I have heard this common in Fords but what are the reasons for hard slam or clunk when shifting Automatic 71 Ford F100 into reverse. It runs fine in reverse but has hard clunk when shifting it into reverse gear?
Bronco_77
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Re: Slam or Clunk in Reverse

Post by Bronco_77 »

My 77 bronco does the same thing only in reverse forward is fine. I checked my fuild the other day and it looked like u dipped it out of a mud hole. I'm going try changing the fuild and filter and run it for a month and change it again.
68 f100 390 3 speed on the collom G maw gave to me G paw drove in late 70s till late 80s
77 bronco 302 lifted 5.5 with 33s and rears cut
69 Mustang boss 302 clone bought when was 14 sold when was 28 to build house
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Subzero
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Re: Slam or Clunk in Reverse

Post by Subzero »

Seems like this is common, I could never find the cause. Checked U-joints, rear diff play, lubricated the drive shaft and nothing could be found that was wrong. Used to be kinda violent in my 68' but never hurt anything else and just like you said the ones I've had never made any noise in other gears
1972 F100 Sport Custom-2WD, Aqua Blue and Wimbleton White, LWB, 302 V8 and C4 trans, P/S, P/B - under construction

Gone but not forgotten: 1968 F100 Ranger- 2WD, LWB, original rebuilt 360 V8, Autolite 2bbl carb, C6 Trans, Hedman Headers, Powermaster Racing Starter, H-Pipe and Glasspacks, P/S, P/B, A/C
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ok68crewcab
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Re: Slam or Clunk in Reverse

Post by ok68crewcab »

I think that this is just a Ford thing. Just about every Ford I've had all the way up to a 2008 Super Duty did that.
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