Comfortable hwy rpm
Comfortable hwy rpm
nevrenufhp
07-17-2012, 07:35 PM #1The SD I have is seemingly a put together mass of wrecking yard parts. I dont think it has the right rear gears. What are you guys comfortable with, in rpm, on the freeway? I hit 3k at roughly 61mph. I was thinking of dropping in a set of 2.47 gears from a 380 I saw.
Nice body, tons of ridiculous mechanical issues - 300d turbo 82' /motor 85'
So what are your gears now? Likely 3.07, should be stamped on the diff case on the lower corner under all the soot and road grease. I love these 2.88 + my rear tires are 8% greater diameter than stock. Way more room in the power band now from 50-90mph.
Nice body, tons of ridiculous mechanical issues - 300d turbo 82' /motor 85'
nevrenufhp
07-17-2012, 11:46 PM #4According to an online gearing calc, I have the 3.46 gears. I just hate to take my next road trip with such steep gears. That's 11 hours of screaming at 3k-3100 rpm. I think I'll try to break the bank and get the freeway gears. I did the 3rd member in my pickup last year. It went from 3.55 to 2.75, and makes the freeway much nicer. Got the mpg back up to 13.7.
I think I paid like under $50 for mine, just a bit of work pulling, cleaning, installing, gear oiling.
But love them.
DV has a bunch of nice photos to help you
http://www.peachparts.com/wikka/W123Differential
and a list of options
http://www.superturbodiesel.com/std/thread-2570.html
Make sure and not stretch/rip the brake lines whilst you lower all that subframe
Nice body, tons of ridiculous mechanical issues - 300d turbo 82' /motor 85'
3100k is not so much screaming. I thought peak torques come from 2800-3100. Or so they say, and we are revving the 617 easily to 4500 during normal/aggressive acceleration.
I think I paid like under $50 for mine, just a bit of work pulling, cleaning, installing, gear oiling.
But love them.
DV has a bunch of nice photos to help you
http://www.peachparts.com/wikka/W123Differential
and a list of options
http://www.superturbodiesel.com/std/thread-2570.html
Make sure and not stretch/rip the brake lines whilst you lower all that subframe
Nice body, tons of ridiculous mechanical issues - 300d turbo 82' /motor 85'
Newbie-read this: Cheap Tricks
617.952-220k-Getting built up
larsalan I guess I need to look at this stupid ass drip shit. What you have to like mess with those elements on the pump? What a fucking hassle. then use some wire to hold the throttle open or some shit?
Simpler=Better
07-18-2012, 07:51 AM #7I used to turn around 3,400 at 65ish, sounds "normal" if uncomfortable to me
Newbie-read this: Cheap Tricks
617.952-220k-Getting built up
larsalan I guess I need to look at this stupid ass drip shit. What you have to like mess with those elements on the pump? What a fucking hassle. then use some wire to hold the throttle open or some shit?
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