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Old 10-03-2020, 11:30 AM   #1
bartman
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Default Where to find 3.07 gears for 1030

I have followed all the discussion of matching transmissions and rear axle ratios with interest. My situation is like others who find that I am geared way to low, someone remarked, “you might as well not use 1st gear”, and it’s the truth, as I am getting about 5 miles to the gallon with my 327 stroker! Where should I start looking for a 3.07 gear set, what cars had them. I am using the original 1030.
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Old 10-03-2020, 02:47 PM   #2
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3.15 ratio came in 83 760 turbo diesel with automatic tranny. Good luck. OR buy new one from sweden somewhere I think you can if you gots lots of monies. Other option put ford 8.8 whole rear end in car..
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Old 10-03-2020, 02:58 PM   #3
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I don't see a problem new 1030 gears are cheap and readily available in all ratios.

https://www.randysworldwide.com/prod...ion-gear-sets/
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Old 10-03-2020, 03:21 PM   #4
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https://www.yukongear.com/partslist....Spicer+30+Rear


https://www.summitracing.com/search/...ratio%3A3-08-1
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Old 10-03-2020, 03:42 PM   #5
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Default Pinion length

Thanks for all the information, does anyone happen to know the pinion length?
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Old 10-03-2020, 10:47 PM   #6
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I know for a fact that volvo only uses 3.73 and up dana 30 type gears and sheet in all there rear ends even the ones with gears lower then 3.73.. So normal dana 30 lower then 3.73 gears won't fit in volvo rear end. Maybe those gears in the links will work. I don't know. Maybe that is only the 1031 volvo rear gears that are like that. All the 1030 might be all the same.

Last edited by sbabbs; 10-04-2020 at 03:10 PM..
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Old 10-04-2020, 05:24 PM   #7
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Quote:
Originally Posted by bartman View Post
I have followed all the discussion of matching transmissions and rear axle ratios with interest. My situation is like others who find that I am geared way to low, someone remarked, “you might as well not use 1st gear”, and it’s the truth, as I am getting about 5 miles to the gallon with my 327 stroker! Where should I start looking for a 3.07 gear set, what cars had them. I am using the original 1030.
What transmission are you using? Carb or efi ? 5mpg isn’t unrealistic depending on the use of the go-pedal.
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Old 10-05-2020, 02:29 AM   #8
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Quote:
Originally Posted by sbabbs View Post
I know for a fact that volvo only uses 3.73 and up dana 30 type gears and sheet in all there rear ends even the ones with gears lower then 3.73.. So normal dana 30 lower then 3.73 gears won't fit in volvo rear end. Maybe those gears in the links will work. I don't know. Maybe that is only the 1031 volvo rear gears that are like that. All the 1030 might be all the same.
What I have read that you cant shim 3,54 diffrential with 3,73 gears. It is close but needs something like 3 mm more space.
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Old 10-05-2020, 03:27 AM   #9
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Originally Posted by sbabbs View Post
Maybe that is only the 1031 volvo rear gears that are like that. All the 1030 might be all the same.
The 1030 is built the same way. The "3.73-up" True-Trac is what fits the 3.54 and 3.31 gears also. There is no carrier split, in the Volvo.

Which means, if I understand this correctly... even though (for example) Jeep issued a 3.07 in a Dana 30, it will probably slide onto a Volvo carrier but it's not going to be positioned in the proper place in the pumpkin. It's a lot farther off than shims can correct.
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Old 10-06-2020, 04:26 PM   #10
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I have a carb and a T5 from a ‘83 Camero that I had re-built to race standards. I could probably look up the tranny ratios but it would be academic.
Also installed a hydraulic throw-out bearing and a TruTrac.
The car is a lot of fun, but it really needs a more hiway type gear..
Could I use the 3.31 gears then if I can find them?
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Old 10-06-2020, 04:52 PM   #11
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Only if you use a 1031 housing. 3.31's were only available for 1031 diffs.

The tallest gear ratio for a Volvo 1030 gear set is 3.54.
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Old 10-06-2020, 08:06 PM   #12
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Bakaxel will sell you a 3.07 1030 R&P for $480

http://bakaxel.se/utvaxling-volvo-3-08.html
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Old 10-06-2020, 08:15 PM   #13
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I have a 3.54 R&P and a complete 3.31 rear axle, Mid Hudson Valley, N.Y.
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Old 10-06-2020, 08:51 PM   #14
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Originally Posted by Harlard View Post
Bakaxel will sell you a 3.07 1030 R&P for $480

http://bakaxel.se/utvaxling-volvo-3-08.html
Those gear sets are available locally as well. You need to change the carrier/LSD to use them though.

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I have a 3.54 R&P and a complete 3.31 rear axle, Mid Hudson Valley, N.Y.
You have to be careful. There are 1030 and 1031 versions of 3.54's.
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Old 10-07-2020, 01:07 PM   #15
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Originally Posted by hiperfauto View Post
Only if you use a 1031 housing. 3.31's were only available for 1031 diffs.

The tallest gear ratio for a Volvo 1030 gear set is 3.54.
Isn't a 7.2" ring gear for the 1030? In which case, here are pictures of a 43-13 gear that measures as such. (Which is exactly what I recall putting in my car.)

http://forums.turbobricks.com/showthread.php?t=351997
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Old 10-07-2020, 01:15 PM   #16
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https://forums.turbobricks.com/showp...1&postcount=10


Edit:

This is a 4.10 1030 ring gear.


Last edited by hiperfauto; 10-07-2020 at 03:02 PM..
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Old 10-10-2020, 02:41 PM   #17
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My head is about to explode...so, since I have the original 1980, standard transmission rear end, it’s a 1030 in a 3.73 ratio. Further, since I put a TruTrac in it, this version won’t work with 3.07 gears, correct?
If I purchased a 3.07 set, say from summit, it physically will fit, but not in the correct position, and that it is too far off to shim.
Will my Trutrac fit in a 1031?
At this point, the Ford options are looking better and better, especially since I need wheels....
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Old 10-10-2020, 03:02 PM   #18
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Correct. Any non Volvo Dana 30 gear set taller than 3.73 will require a different carrier.

Yes, your True-Trac will fit a 1031 housing.
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Old 10-10-2020, 04:44 PM   #19
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Ay caramba dude, I think you'll find an 8.8 out of an explorer might suit your needs better. I think I paid $150 from pick and pull and someone sells the weld on Volvo brackets, wish I'd known before I cut everything off the 1031. Anyway if you shop right you can get a Ford traction-lok already installed and V8 ratios. I put in the Cobra clutch kit and it lights up both rear 275's. I went the other way for quicker spool and got a 4.10. If you have any fab skills you will probably come out cheaper than paying for a new gearset and having someone set it up. Plus you won't be crying when your 327 breaks you redone 1030/31.
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