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Re: Rear End: Gear Ratios, brands, noise levels
FroOch #114122 December 16th 2006 11:06 pm
Joined: Apr 2001
Posts: 1,097
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I wrote a post about a month ago

https://www.vanning.com/threads/ubbthreads.php?ubb=showflat&Number=80410&page=1#Post80410

( See 407 stroker ) about chevy 10 bolt rears. Most drive line parts break on the launch. If your not going to put 12" slicks on the van and try to pull the front end off the ground it might hold up. Consider the fact that the its a van and 65% of the weight is in the front. Most of the time you will be spinning the tires. You won't be hitting the NOS until second gear. Before you spend the big bucks for a Detroit locker and a Ford 9 " carrier you will have to have shortened, have a look at this site. It has some good info on the 10 bolt.


http://www.chevyhiperformance.com/techarticles/48518_posi_10_bolt_upgrade_install/index.html

After I posted this, we have had some real nice weather here in the east so I took advantage of the sunshine and got a few things done to my heavy full size Beauville window van. Swapped out the TBI unit with a bored and polished throttle body. Fuel pressure adjustment via an adjustable regulator I added to the TBI unit. A fresh set of plugs. A fresh fuel pump. It was due to be changed out anyway had 115k on it. ( thanks for the help Josh ) Bumped the timing a few degrees. and so on. With the 8.5 10 bolt rear and the OEM governor style posi, it lock up and spin the tires when I nail it from a stop. I have some decent sized BFG's on there too. I don't expect to be doing that everyday and I certainly don't expect it to hold up if I was. I said before in a post. The factory Chevy governor posi is good set up not to be overlooked for a daily driver.

ps:

In case you havent seen one of these rears, the difference between a convential posi and a governor style carrier is that the governor via a centrifical arm moves out when you have a free wheeling side gear ( one wheel spinning when your in mud or snow ) and then engauges the posi clutches. All other times it operates as a regular open end rear. no noise on turns no posi clutch wear during daily driving. This is just my opinion. I hope you like the idea.



Take Care, Billy

Have Van Will Travel

Re: Rear End: Gear Ratios, brands, noise levels
Billvill #116886 January 07th 2007 5:04 am
Joined: Oct 2002
Posts: 3,601
Likes: 10
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My previous, and possibly wifes new one if I get her to agree to trading our truck even, it has a 95 305 TBI, 400 turbo but a 3.07 gear ratio, I'll really be looking for a change, swap in a lower one from the junk yard. It felt so gutless being a conversion hightop, I'd look into upgrading to a 700R4 in the furure.

Re: Rear End: Gear Ratios, brands, noise levels
Billvill #139032 June 09th 2007 3:48 pm
Joined: Apr 2001
Posts: 1,097
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If you haven't swapped out your rear end gears yet, I can highly recommend the 3.73's with the overdrive trans. I ran up to LMDW a few weeks back and it was my first highway trip with the 3.73 gears in the truck. It ran great at 75 in OD with a light trailer. The van was begging to be let out but I have never seen so many cops on the Thruway. Here is the real kicker, the fuel mileage was the best I have ever had from any of my TBI motors.


Take Care, Billy

Have Van Will Travel

Re: Rear End: Gear Ratios, brands, noise levels
Billvill #139197 June 11th 2007 9:31 am
Joined: Jun 2003
Posts: 12,898
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I have 2:73's in my 1978 Chev with a 3 speed Auto...runs at 70 no prob, and about 14 mpg
In the Astro, when I blew the differential up, I went from 3:55's down to 3:23's ....lots better mileage.
In the Dodge, I have 3:90's 0-60 in 6 blocks, but runs all day at 70.00 with about 14.5 MPG
The Aerostar with a Flat Head, 8 inch posi with 2:90's so far


I don't need to be honoured by Vanning, I am honoured to be Vanning !
Supporting Vanning, by going Vanning In A Van !
I hate it, when real life interferes with Vanning !
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Re: Rear End: Gear Ratios, brands, noise levels
Doc 2% of Canada, EH!!!! #139200 June 11th 2007 9:45 am
Joined: Apr 2001
Posts: 1,097
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In my lawn tractor, I have 8.20's an it get terrible mileage in 3rd gear with the blades engaged. Eh


Take Care, Billy

Have Van Will Travel

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