4 Speed Transmission Overdrive

Engine, transmission, rear-end, driveline, etc..

4 Speed Transmission Overdrive

Postby elhorn14 » Mon Sep 06, 2010 8:00 pm

I've been wondering if anyone makes an overdrive for a 4 speed manual in a 71 D200. I've been interested in getting some kind of gas mileage at all.
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Re: 4 Speed Transmission Overdrive

Postby elacruze » Tue Sep 07, 2010 8:09 am

Do some digging with the search function, this has been discussed at length a few times.

I bought a close-ratio a833 and gear vendors overdrive for mine, but they're not installed yet.

There is no easy option to install an OD a833 unless you have the correct bellhousing.

I found the Gear Vendors on Craigslist for $500. I have to build some brackets to mount it in place of the center support bearing, and find an appropriate input yoke, then get a bearing and seal to make it a stand-alone unit. The complete setup from GV that bolts directly to the back of your transmission is around $2700 new. I plan to install the a833 on my np435 bellhousing, so I'll have to drill some holes and perhaps add some plating to accomodate.

The pilot hole and input shaft are the same from a 23 spline a833 OD transmission, so only the mounting holes have to be sorted.

I've also considered buying a steel bellhousing which fits the transmission, and welding up frame and clutch cylinder mounts. This is probably the easiest way, but a lot more expensive.
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Re: 4 Speed Transmission Overdrive

Postby BradyB » Tue Sep 07, 2010 11:52 am

$500 for a gear vendors, that's awesome. I hope it works nicely.
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Re: 4 Speed Transmission Overdrive

Postby elhorn14 » Wed Sep 08, 2010 7:52 pm

Thanks for the advice. I was wondering if it was even possible, but now that you've made mention i think ill look into it. Ive actually been looking at gearvendors for a while but wasn't sure if they had something for my 40 year old truck. Sounds like a lot of work i dont know how to do, or have the money for, so perhaps ill just keep it the way it is for now. Oh btw the truck is for sale for 500 bucks.
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Re: 4 Speed Transmission Overdrive

Postby DodgeGuy » Fri Oct 22, 2010 8:01 am

for a overdrive,i went to passon performance.I went with the transmission.You can buy the gear-set and swap in the overdrive.1st gear is 2:66,2nd gear is 1:59,3rd gear is 1.00:1,4th gear is.80:1.
No shifter change or drive shaft change.
GOOD LUCK
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Re: 4 Speed Transmission Overdrive

Postby ledman70 » Thu Oct 28, 2010 2:38 pm

There's an easier/cheaper way. I'm new to Sweptlines, but not Mopars. I just pulled an 833 out of my 64 Polara with 3:91's because it was TERRIBLE on the freeway, and swapped in an OD 833 I picked up for $50. I had to buy a new 4.8" bearing retainer due to the early bellhousing only having a 4.3" hole. Then I had a machine shop open the bellhousing to match the 4.8" br. Brewersperformance makes an adapter ring in case I have to go back to the standard 833, that's why I did it this way. Cost me $80 for the br, $100 for the machinning, but now the car cruises 2200rpm at 65mph and it's MUCH nicer to drive. I think the truck bellhousings already have a 5.125 br opening, and that's what the OD 833's come standard with, so it could possible be a direct bolt-in with the right parts. I was told the OD 833's weren't strong enough to handle much HP, but the 426 wedge in my Polara is cranking out over 400 HP and I slam it regularly without mercy....so far so good, but it's only been in for about 500 miles. :dance
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Re: 4 Speed Transmission Overdrive

Postby beastman » Thu Oct 28, 2010 9:10 pm

hahaha post up here if that tranny ever gives. im using the same thing behind my 318 in my 70 d100
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Re: 4 Speed Transmission Overdrive

Postby demulsion » Sun Oct 31, 2010 1:36 am

elacruze wrote:I plan to install the a833 on my np435 bellhousing, so I'll have to drill some holes and perhaps add some plating to accomodate.


Here is what you're up against...
Image
Image

Hope that helps!
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Re: 4 Speed Transmission Overdrive

Postby robbins » Thu Aug 17, 2017 10:15 am

:banghead
Last edited by robbins on Thu Aug 17, 2017 12:54 pm, edited 1 time in total.
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Re: 4 Speed Transmission Overdrive

Postby moparlee » Thu Aug 17, 2017 12:51 pm

elhorn14 wrote:I've been wondering if anyone makes an overdrive for a 4 speed manual in a 71 D200. I've been interested in getting some kind of gas mileage at all.


71's are z-bar correct....I have an 80's small block truck OD833 (which isn't for the 435 style) truck bellhousing if you're interested.
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Re: 4 Speed Transmission Overdrive

Postby soopernaut » Fri Aug 18, 2017 5:06 am

moparlee wrote:
elhorn14 wrote:I've been wondering if anyone makes an overdrive for a 4 speed manual in a 71 D200. I've been interested in getting some kind of gas mileage at all.


71's are z-bar correct....I have an 80's small block truck OD833 (which isn't for the 435 style) truck bellhousing if you're interested.


That guy hasn't visited the forum in 7 years.
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