Author Topic: new gear installed finally  (Read 2152 times)

Jeff73Mach1

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new gear installed finally
« on: September 10, 2009, 08:18:49 PM »
Well I got the new chunk for my 9" rear end and got em swapped out while I was at work today.

Previous gear was thought to be a 4;56 but turned out to be either a 4:63 Richmond gear set with a 37 tooth ring and an 8 tooth pinion or a 4.11 with the 37 tooth ring and 9 gear pinion.

Turning the yoke and counting has me fairly certain it was the 4.11 but either way my rpm's at 70 dropped from 4000 down to 3200.

I gave up some bottom end power, but the overall change in the car was very pleasant.  It is quieter, runs a bit cooler and doesn't require quite as much shifting to stay on the power band.

My speedometer was 10%+ fast before and is now about 5% slow until I can get the proper speedometer gear in, but that is manageable as it still keeps me within the range of most officer's general leeway if I am not blatantly violating the law.

Now I have to decide if keeping the spare chunk is worthwhile.  Gears and bearings all look excellent and it is a "N" marked case which I suppose means nodular.  28 spline and track lok with Richmond brand gears.  I let my mechanic change it out and he did not transfer the pinion snubber over, so it looks like I am going to have to crawl under the car at some point to correct this.

I hate working under cars!  I would have changed the rearend myself, but Larry is a friend and has a lift and a shop and rarely charges me more than just a token amount.  Besides he sold my Volvo for me yesterday for far more than I was expecting (an extra grand) so I thought throwing business his way was just the right thing to do.

I could actually go on a roadtrip now!

Tim175

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Re: new gear installed finally
« Reply #1 on: September 10, 2009, 10:33:37 PM »
congrats i cant wait to change mine out, glad it worked out in your favor.

Soaring

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Re: new gear installed finally
« Reply #2 on: September 11, 2009, 03:26:44 PM »
Yeah, anything above 355's is just insane for highway driving.  My Mach1 cruises at 2K RPM at 75 MPH.

Jeff73Mach1

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Re: new gear installed finally
« Reply #3 on: September 11, 2009, 09:45:37 PM »
I agree, the whole car just feels better and happier, though the rip roaring burnouts into third gear are a thing of the past until I build a 500 HP monster LOL

Tim175

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Re: new gear installed finally
« Reply #4 on: September 12, 2009, 12:18:01 AM »
Yeah i bet you miss the awesome acceleration haha

Jeff73Mach1

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  • Mustang: 1973 Mach 1
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Re: new gear installed finally
« Reply #5 on: September 12, 2009, 06:55:59 AM »
I do miss it, but I also knew to expect that and have been planning on a hotter engine all along, though 500 HP is not my actual goal  I am shooting for 450 in both hp and torque.  I think that will give me adequate performance without ripping the driveline apart too quickly

 

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