ratcheting sound when under heavy load

ANYTHING TO DO WITH MAKING YOUR VAN MOVE EXCEPT FOR THE ENGINE ITSELF.
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Captn. Crunch
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ratcheting sound when under heavy load

Post by Captn. Crunch »

My buddy got his dump truck stuck in my yard yesterday so We hooked a tow chain to the hitch on my AWD Safari to get him moving. My wheels were all on soft dirt and when I gave it the gas a not too pleasant noise eminated from the underside of my truck. It was a ratcheting kinda noise, I backed off-hit it again pulled the truck free, noise didn't repeat. Transfer case chain? Rolling over spines on a shaft? This sound familiar to anyone?
Any excuse for an upgrade!!!

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Captn. Crunch
"I don't beat my rig-I use it to it's maximum potential"
1994 Safari conversion (sold) and miss'n it!
1999 Safari SLE AWD junked
2003 GMC Safari AWD SLT
cast iron Torsen equipped front diff
S-10 leafs-G80 rear w/3.73’s
2” body lift w/Falken Wildpeak AT’s
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doyoulikeithere
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Re: ratcheting sound when under heavy load

Post by doyoulikeithere »

Thats awesome that you pulled out a dump truck that was stuck :yikes: :guitar:
Nice !
I'm not sure about the sound though.
I've heard a ratcheting kind of sound like that before, and that was when I was in an Oldsmobile being rope towed by a truck. It wasn't running, and had no brakes.
Anyways I put it in park while it was still rolling, and it didn't come to screeching halt, instead it made a distinct ratcheting sound, and kept rolling along.
So, I'm wondering if when you put it into gear to go, instead of engaging properly, your trans actually made that same ratcheting sound which I assume must be some kind of a safety mechanism to avoid breakage if it isn't in gear properly, or is rolling and shifting to park or something?
I bet the first thing you did was run the shifter up to R and then down to D then try again eh?
2021 Yamaha Tenere 700 - Blue.
2016 Yamaha XSR900 - Silver.
1990 Astro - AWD - Brown.
1987 Astro - With 5 Speed & 4wd - Silver & Blue.

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Captn. Crunch
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Re: ratcheting sound when under heavy load

Post by Captn. Crunch »

It was only a mason dump but it had a load on it and yes-it was awesome!!! I know the sound your talking about, it's the parking pawl, the same bugger that makes it hard to get out of park after parking on a hill. The sound was similar but more urgent if you know what I mean. I was already in low and rolling forward taking up the slack in the chain. He yelled "hit it" and I did. The truck sat down and started pulling hard almost no wheel slip and GRRRRRRRRRRR. I lifted and hit it again and we were good. The S.O.B. that sold me this truck said he had the transfer case re-built by a pro, but his word doesn't hold much weight with me anymore. Not after the steady stream of parts that I've put into it since buying this "well maintained" van.
Captn. Crunch
"I don't beat my rig-I use it to it's maximum potential"
1994 Safari conversion (sold) and miss'n it!
1999 Safari SLE AWD junked
2003 GMC Safari AWD SLT
cast iron Torsen equipped front diff
S-10 leafs-G80 rear w/3.73’s
2” body lift w/Falken Wildpeak AT’s
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doyoulikeithere
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Re: ratcheting sound when under heavy load

Post by doyoulikeithere »

Maybe you should look for a good used NP241.
2021 Yamaha Tenere 700 - Blue.
2016 Yamaha XSR900 - Silver.
1990 Astro - AWD - Brown.
1987 Astro - With 5 Speed & 4wd - Silver & Blue.

Topic author
Captn. Crunch
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Re: ratcheting sound when under heavy load

Post by Captn. Crunch »

Here is an update to close this old thread. I could have sworn the noise was something slipping in the drivetrain. You could feel it through the steering wheel, it changed along with engine rpm and it only happens when you really romp on it. What was actually happening was two worn out idler arms were allowing the center link to rotate it and contact the harmonic balancer. Two Moog idlers later all is well
Captn. Crunch
"I don't beat my rig-I use it to it's maximum potential"
1994 Safari conversion (sold) and miss'n it!
1999 Safari SLE AWD junked
2003 GMC Safari AWD SLT
cast iron Torsen equipped front diff
S-10 leafs-G80 rear w/3.73’s
2” body lift w/Falken Wildpeak AT’s

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Re: ratcheting sound when under heavy load

Post by Cobra »

oh so it was actually a steering problem I believe Lifted had a similar problem while wheeling, his center link would flex up into the harmonic balancer. I think he said it threw sparks too lol
1998 GMC Safari AWD, BFGoodrich AllTerrain T/A
Jet performance tuner 91 octane preset, Jet under-drive pulleys
Rancho 999000 series shock, on-board controller to be installed later
DHC rock rails and skid plate Add-A-Leaf
G3500 front calipers
Zexel Torsen Diff
11" drums
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LiftedAWDAstro
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Re: ratcheting sound when under heavy load

Post by LiftedAWDAstro »

Yup. Sure did throws lots of sparks! :muhaha:
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition

Mileage spreadsheet

Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy
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