Ford f100 1970 automat ger problem

Clutch, transmission, rear axle

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johnny55
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Ford f100 1970 automat ger problem

Postby johnny55 » Tue Nov 14, 2017 2:01 pm

Hey all. I have a Ford F100 Ranger 1970 with a 390 and C6 automat. My problem is that when I put in switch D, it sounds a bit like it hits. (donk) same with the other switches. R, N, 2, 1. The pickup goes well and feels good. but when I'm standing still with the pickup and going to put D in the engine and switching on, it will "donk" it. hard to explain in words. someone like what it might be wrong ?? What can I do so it's quiet and gentle to switch? do you understand what I mean? Is not so good at writing in English

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1972hiboy
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Re: Ford f100 1970 automat ger problem

Postby 1972hiboy » Tue Nov 14, 2017 2:47 pm

I do not think a little " clank" is out of the ordinary. my uncles 70 f250 has made a similar noise for years. however if its alarmingly loud some things to check would be, play in the rear axle pinion bearing, or worn universal joints in the driveshaft, or even possibly the idle speed is set high and it bangs into gear.
Rich
1973 f350 super c/s 460/c6 22k orig miles
1972 f350 srw crewcab special 390
1972 f250 ranger XLT Camper Special 390
1972 f250 4x4 custom 84k og miles 390
1971 f250 4x4 sport custom 56k og miles. 360
1970 f250 4x4 428 fe hp60 205 d60
Dont eat yellow snow.....

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Re: Ford f100 1970 automat ger problem

Postby fordman » Tue Nov 14, 2017 6:02 pm

Could just be a U joint. Grab the driveshaft or shafts and twist them while in part. They should not turn at all. If they do turn a little look at the U joints while twisting back and forth. If the rear end yoke gives a little then it could be a worn rear end as already stated.

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Jacksdad
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Re: Ford f100 1970 automat ger problem

Postby Jacksdad » Tue Nov 14, 2017 10:24 pm

I was going to say the same thing - check your UJs. They can get pretty loud.
1971 DRW F350 cab and chassis with an Open Road motorhome conversion, Dana 70, 352 (originally 390)/C6, PS, power front discs, and 159" w/b.

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Re: Ford f100 1970 automat ger problem

Postby johnny55 » Wed Nov 15, 2017 10:09 am

thanks so much for your help. can anyone explain what u joint is. have a little hard to understand it. someone who has a picture of what I'm going to look at.

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1972hiboy
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Re: Ford f100 1970 automat ger problem

Postby 1972hiboy » Wed Nov 15, 2017 12:45 pm

johnny55 wrote:thanks so much for your help. can anyone explain what u joint is. have a little hard to understand it. someone who has a picture of what I'm going to look at.
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Rich
1973 f350 super c/s 460/c6 22k orig miles
1972 f350 srw crewcab special 390
1972 f250 ranger XLT Camper Special 390
1972 f250 4x4 custom 84k og miles 390
1971 f250 4x4 sport custom 56k og miles. 360
1970 f250 4x4 428 fe hp60 205 d60
Dont eat yellow snow.....

johnny55
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Re: Ford f100 1970 automat ger problem

Postby johnny55 » Wed Nov 15, 2017 3:57 pm

Thank you for the picture. will go under the car this weekend and look and see if I can find the error. just do not think I recognize it on the picture ?? :-)

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1972hiboy
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Re: Ford f100 1970 automat ger problem

Postby 1972hiboy » Wed Nov 15, 2017 6:50 pm

johnny55 wrote:Thank you for the picture. will go under the car this weekend and look and see if I can find the error. just do not think I recognize it on the picture ?? :-)
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Rich
1973 f350 super c/s 460/c6 22k orig miles
1972 f350 srw crewcab special 390
1972 f250 ranger XLT Camper Special 390
1972 f250 4x4 custom 84k og miles 390
1971 f250 4x4 sport custom 56k og miles. 360
1970 f250 4x4 428 fe hp60 205 d60
Dont eat yellow snow.....

cep62
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Re: Ford f100 1970 automat ger problem

Postby cep62 » Wed Nov 15, 2017 7:45 pm

Also if your engine is idling fast it will drop into gear hard.

When the engine is warm it should idle around 750 ?RPMs in gear.
If your choke doesn't open all the way you may have a fast idle.

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sargentrs
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Re: Ford f100 1970 automat ger problem

Postby sargentrs » Thu Nov 16, 2017 5:04 am

Another member's U-joint problem. viewtopic.php?f=4&t=86444
Randy
1970 F100 Sport Custom Limited LWB, 302cid, 3 on the tree. NO A/C, NO P/S, NO P/B. Currently in 1000 pcs while rebuilding. Project thread: viewtopic.php?f=22&t=59995 Plan: 351w, C4, LSD, pwr front disc, p/s, a/c, bucket seats, new interior and paint.
1964 Ford Fairlane 500. 289/Cruise-O-Matic, A/C, P/S.

johnny55
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Re: Ford f100 1970 automat ger problem

Postby johnny55 » Thu Nov 16, 2017 9:41 am

thanks for pictures. now I understand. this was changed last summer in the summer so it may not be it ?? when I bought the pickup it was bad so it was changed. humm what can it be then ?? It's not a lot of "Clank" and it's rocking, but it's a bit disturbing because it's supposed to be soft when the gear goes in and almost does not feel at all. humm wonder what it might be then ?? any other suggestion ?

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1972hiboy
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Re: Ford f100 1970 automat ger problem

Postby 1972hiboy » Thu Nov 16, 2017 11:51 am

* Engine / transmission mounts?

* high idle speed?

What things have you checked?
Rich
1973 f350 super c/s 460/c6 22k orig miles
1972 f350 srw crewcab special 390
1972 f250 ranger XLT Camper Special 390
1972 f250 4x4 custom 84k og miles 390
1971 f250 4x4 sport custom 56k og miles. 360
1970 f250 4x4 428 fe hp60 205 d60
Dont eat yellow snow.....


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