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05-11-2018, 05:06 PM | #1 |
Senior Member
Join Date: May 2010
Location: PLYMOUTH MASS
Posts: 860
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grinding 1st gear
So ,Please let me start with a little history ,Finally got my 39 1/2 ton running . GOOD . Been driving it to work everyday (loving life been waitin 28 years) for the last 2 weeks .The first few days shifting nice , when it gets hoter after driving 45 min or so , backroads ,stop sighs. it get hard to get into 1st . if I take my time an pull to the left a little it will go in . Ive lowerd the idle. checked the fluid,,, Added a little . but it still persist. I hate riding my clutch. and I know its wrong ! It sounds like its definitely with the idle ,,,,punch it down ,,, but it doesnt , Im running a 7Rt truck carb which is original to the truck. Hey an thanks guys up frontjust
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05-11-2018, 05:18 PM | #2 |
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Join Date: Jul 2016
Location: Lake worth Florida
Posts: 1,099
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Re: grinding 1st gear
Have you tried shifting into 2 after stopping and before sticking it in 1st ?
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05-11-2018, 08:16 PM | #3 | |
Senior Member
Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,779
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Re: grinding 1st gear
Quote:
If it still grinds going into 1st, the clutch is dragging. Make sure the freeplay is properly set. |
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05-11-2018, 09:14 PM | #4 |
Senior Member
Join Date: May 2010
Location: MN
Posts: 7,053
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Re: grinding 1st gear
Double clutch it.
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05-11-2018, 09:56 PM | #5 |
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Join Date: Jan 2011
Location: sw minnesota
Posts: 4,573
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Re: grinding 1st gear
got the correct free play on the pedal so the clutch is not dragging?
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05-11-2018, 10:13 PM | #6 |
Senior Member
Join Date: May 2010
Location: Alabama
Posts: 3,260
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Re: grinding 1st gear
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05-12-2018, 12:36 AM | #7 |
Senior Member
Join Date: May 2010
Location: Mid coast Maine
Posts: 1,878
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Re: grinding 1st gear
You may not have the original trans,39 is a one year lever on trans.
If the lever is like from a 32 its longer say 4" the 39 should be about 3 1/2" Long. By being shorter it will stop clutch drag. I found that out on my 39 sedan. |
05-12-2018, 02:15 AM | #8 |
Senior Member
Join Date: May 2010
Location: Solihull, England.
Posts: 8,750
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Re: grinding 1st gear
This is a video I made of how to check if the clutch is releasing.
Disclaimer - it may seem brutal to a person not familiar with what is being done. It does Require skill and finesse, and if done carefully will not distress the gear teeth. https://youtu.be/PC_1gKwSrZE Mart. |
05-12-2018, 05:04 AM | #9 |
Senior Member
Join Date: May 2010
Location: Oamaru, New Zealand
Posts: 419
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Re: grinding 1st gear
What grade gear oil are you using? It seems okay when its cold, when the oil is thick. As it warms up, the oil is getting thinner (lighter), and not slowing the cluster down as quickly.
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05-12-2018, 11:29 AM | #10 |
Senior Member
Join Date: May 2013
Location: Wellington, Kansas
Posts: 444
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Re: grinding 1st gear
I like your videos Mart.
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05-23-2018, 05:12 PM | #11 |
Senior Member
Join Date: May 2010
Location: PLYMOUTH MASS
Posts: 860
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Re: grinding 1st gear
Thankyou gentleman . Putting it 2cd ,then into 1st is the trick ,for sure . I have been driving "Doris" to work everyday for the last month . .Thanks again Mike P
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05-27-2018, 01:55 PM | #12 |
Senior Member
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 1,981
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Re: grinding 1st gear
Good video Mart. Thanks for sharing it!
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05-29-2018, 06:27 AM | #13 |
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Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 1,981
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Re: grinding 1st gear
Hi George,
I'm curious about your mention about the different arm lengths, "If the lever is like from a 32 its longer say 4" the 39 should be about 3 1/2" Long. By being shorter it will stop clutch drag". Which arm are you referring to, the external one on the clutch shaft or the throughout bearing arm? Don't see how the throughout arm could be of a different length. I have a 39 transmission in my 32 with stock 32 pedals and arms. Glenn |
05-29-2018, 08:08 AM | #14 | |
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Join Date: May 2010
Location: East Shore of LAKE HOUSTON
Posts: 11,113
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Re: grinding 1st gear
Quote:
Just for yuks, here is a comparison of the different arms available. DD |
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05-29-2018, 08:20 AM | #15 |
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Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 1,981
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Re: grinding 1st gear
Great, thanks George!
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05-29-2018, 08:29 AM | #16 |
Senior Member
Join Date: May 2010
Location: East Shore of LAKE HOUSTON
Posts: 11,113
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Re: grinding 1st gear
Please, PLEASE don't ever confuse ME with George! DD |
05-29-2018, 08:29 AM | #17 |
Senior Member
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 1,981
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Re: grinding 1st gear
Looks like I need to get a 39 arm. My clutch releases close to the floor board with maybe 3/4” to 1” of free movement at top.
Glenn |
05-29-2018, 08:31 AM | #18 |
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Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 1,981
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Re: grinding 1st gear
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05-29-2018, 08:32 AM | #19 |
Senior Member
Join Date: May 2010
Location: East Shore of LAKE HOUSTON
Posts: 11,113
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Re: grinding 1st gear
We're cool! I THINK Drake has that arm in repro. DD |
05-29-2018, 01:46 PM | #20 |
Senior Member
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 1,981
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Re: grinding 1st gear
George where you able to clear the ant-chatter rod or remove it? Looks to me that the 39 arm can’t be used in the 42 without taking out the ant-chatter rod.
Thanks, Glenn |
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