crashbox grinding until warm.

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Aug 16, 2015 | 04:35 AM

JPMallory

Thread Starter

Laughing Gas

Joined: Feb 2014

Posts: 794

Likes: 120

From: Behind the wheel, IN

crashbox grinding until warm.

I've noticed this for a while now. When I first start my truck up, the 4 speed crashbox wants to grind the gears (up and downshifting) for the first few miles. After a few miles, it gets better and I can shift with no issues.

I'm running 85w140 in the gearbox. Do I need to switch to a single weight oil?

Aug 16, 2015 | 06:06 AM

fordf348

Laughing Gas

Joined: Jan 2011

Posts: 1,231

Likes: 199

From: near Philadelphia Pa

I recently switched to straight 140 wt, it seems to help a little, but it is still kike driving an old truck
Ed

Aug 16, 2015 | 08:15 AM

3twinridges

Cargo Master

Joined: Nov 2014

Posts: 2,442

Likes: 256

Get your rpm's up higher on the first couple of shifts and make the shift from first into second quick. I have best results with 140 also.

Aug 16, 2015 | 09:36 AM

38 coupe

Cargo Master

Joined: Aug 2010

Posts: 2,927

Likes: 136

From: Houston

I typically start up the engine about 3-5 minutes before I actually want to drive. I let the engine warm up until it runs smoothly without choke. This also warms up the gear oil in the transmission.