by How do you know that you actually have a 3:73? Have you seen what ring and pinion numbers are stamped on the ring gear?
+3
ditdater
ChevyVanMan1
donivan65
7 posters
1965 g 10 rear end info
donivan65- Governor
- Number of posts : 12220
Location : San Diego, California
Registration date : 2008-05-12
Twinpilot001- Number of posts : 6186
Location : spokane ,Wa.
Registration date : 2009-09-28
to add to the confusion?? My 1967 10 bolt has a 3:73-1 ratio posi from the factory.Origional to the van.
ChevyVanMan1- Number of posts : 425
Location : Your Nation's Capital
Registration date : 2009-07-19
Actually, I've driven my 10bolt rear with the 3.08 gears and it does fine down the highway. Have what looks like a stock L6
and 1bbl carb, NOS. Haven't checked mpg before or after yet it doesn't seem to roar at all at 65mph. Makes 1st a little long so it is harder to stay in 2nd while creeping up to a light.
The physics of the van are so poor aerodynamically I doubt there is much one can do for good gas mileage other than staying under about 45mph all the time. I think 45mph is the rule of thumb for when aerodynamic drag equals mechanical drag and then really starts to pile up as air is compressed in front over 45. Maybe knocking out the front and back glass would help too ;-) Drove that way one time to the glass shop and it was a blast but a little chilly on the highway.
and 1bbl carb, NOS. Haven't checked mpg before or after yet it doesn't seem to roar at all at 65mph. Makes 1st a little long so it is harder to stay in 2nd while creeping up to a light.
The physics of the van are so poor aerodynamically I doubt there is much one can do for good gas mileage other than staying under about 45mph all the time. I think 45mph is the rule of thumb for when aerodynamic drag equals mechanical drag and then really starts to pile up as air is compressed in front over 45. Maybe knocking out the front and back glass would help too ;-) Drove that way one time to the glass shop and it was a blast but a little chilly on the highway.
chester42- Number of posts : 1383
Location : Homosassa,FLA
Age : 81
Registration date : 2009-04-06
Donivan, I ended up puting 3:40 gears in my 12 bolt and veryhappy with results. 1800 rpm at 60mph.
donivan65- Governor
- Number of posts : 12220
Location : San Diego, California
Registration date : 2008-05-12
Leftcoast65 wrote:donivan65 wrote:The 3:36 is the best for speed and economy compared to the 3:73 and the 4:11,,,,,,,they did put the 3:08 in the 69 and 70 vans with a V8,,,,,,,,,and we put the 2004R and 700R4 OVERDRIVE automatic transmissions in to get the best of both worlds,,,,the plan is always to get the van to go further with each RPM the engine turns,,,,,bigger tires will also do that,,,,,,but there is a limit of how much power the engine can put out to make those wheels turn,,,if the engine is not running in its power band,,,,then you are not saving any gas,,,,,
Don do you have to put in the auto trans to get the best speed and economy?
I am thinking that under most conditions, the 700R4 and 2004R get less mileage,,,,,if you are in OVERDRIVE, with the torque converter locked up and going 60 mph on a nice long flat road, it would get the best MPG that a Van would of ever seen,,,,,,HOWEVER,,,,,as soon as the trans is in 1,2 or 3rd gear, the torque convertor is slipping up a storm, using more gas than a manual transmission in those same gears,,,,,a 3 speed 6 cylinder Van with a 3:36 rear end might get 18 MPG on long trips,,,,,,it just depends on what kind of trips you make,,,,as to what the best mileage would be,,,,,,you would have to make a lot of real long trips to make up the cost of converting over to an Overdrive transmission,,,,,,
Leftcoast65- Number of posts : 77
Location : Sunny (most of the time) San Diego
Registration date : 2011-08-27
donivan65 wrote:The 3:36 is the best for speed and economy compared to the 3:73 and the 4:11,,,,,,,they did put the 3:08 in the 69 and 70 vans with a V8,,,,,,,,,and we put the 2004R and 700R4 OVERDRIVE automatic transmissions in to get the best of both worlds,,,,the plan is always to get the van to go further with each RPM the engine turns,,,,,bigger tires will also do that,,,,,,but there is a limit of how much power the engine can put out to make those wheels turn,,,if the engine is not running in its power band,,,,then you are not saving any gas,,,,,
Don do you have to put in the auto trans to get the best speed and economy?
jrinaman- Number of posts : 890
Location : zelienople,pa.
Age : 59
Registration date : 2011-03-10
my 250 has cam, headers and higher compression. it pulls the hills fine but would be happier with a little more off the line. i pull a camper sometimes and does ok but nothing to brag about. gearing really wont effect that once i am moving, it will just downshift later. as i said, most would be happy with my gearing but i am not most. now a 5 speed would give me both.
ditdater- Number of posts : 590
Location : louisville ky
Registration date : 2010-11-06
i guess i will be good w/ a 230 / and 10 bolt combo i/ll have , not looking to tow ,but like to have highway gears .
donivan65- Governor
- Number of posts : 12220
Location : San Diego, California
Registration date : 2008-05-12
Thats the thing,,,,you need to have power to back you up,,,,,my buddy Dave has a 250 engine with a 700R4 and a 4:11,,,,,,he is happy with it,,,,,,VanAgain has a 250 with a 700R4 and a 3:73 and has trouble going up hills,,,,,,,I have a 250 with a 3 speed manual and a 3:36,,,,,,,I surely have trouble towing a vehicle up a hill,,,,but I can cruise at 70 MPH,,,, I left them both behind when we were racing,,,everything has to match,,,,you can't get greedy and have it all,,,,,,
jrinaman- Number of posts : 890
Location : zelienople,pa.
Age : 59
Registration date : 2011-03-10
dont want 411's
jrinaman- Number of posts : 890
Location : zelienople,pa.
Age : 59
Registration date : 2011-03-10
i would gladly trade my 336 for a 373. i have the 700r4 tranny and most would consider it to be about perfect with 336 but would trade a little off the top for more low end power. i gained about 30% with overdrive and 373 would only be giving 10% back.
donivan65- Governor
- Number of posts : 12220
Location : San Diego, California
Registration date : 2008-05-12
3:73 and 4:11 rear ends are bigger,,,they have 12 bolts in the cover and ring gear,,,,,so if you got a 10 bolt, it should say 11-37 on the ring gear,,,,,that is the number of teeth on the pinion and ring gear,,,,or count them,,,,(37 divided by 11 equals 3.36) the driveshaft has to turn 3 1/3 times to get the tires to turn 1 time,,,,,,so it has the highest gear ratio,,,,,,,those other ratios have to turn faster to get the same job done,,,,,,and that means higher RPMs, noise and gas to get the job done,,,,,,and the job is making the van do 55 MPH,,,,,,
ditdater- Number of posts : 590
Location : louisville ky
Registration date : 2010-11-06
i have a 10 bolt cover on rear end , are you saying it has to be a 3;36, because it sure felt higher , but only 3;36 came in 10 s in 65 for sure, if it is stock ,which i am sure it is stock.
donivan65- Governor
- Number of posts : 12220
Location : San Diego, California
Registration date : 2008-05-12
If you have 10 bolts on the rear end cover, thats the best one,,,,,a 3:36,,,,,,,
ditdater- Number of posts : 590
Location : louisville ky
Registration date : 2010-11-06
yeah , i was thinking the rear in this 4 cylinder van has to be redlite-to-red lite gears , so after we swap it out for the 230 ready to go , i saw the ring and pinion 3;36 from a 65 g10 now on the bay , and thought about bidding on them
donivan65- Governor
- Number of posts : 12220
Location : San Diego, California
Registration date : 2008-05-12
The 3:36 is the best for speed and economy compared to the 3:73 and the 4:11,,,,,,,they did put the 3:08 in the 69 and 70 vans with a V8,,,,,,,,,and we put the 2004R and 700R4 OVERDRIVE automatic transmissions in to get the best of both worlds,,,,the plan is always to get the van to go further with each RPM the engine turns,,,,,bigger tires will also do that,,,,,,but there is a limit of how much power the engine can put out to make those wheels turn,,,if the engine is not running in its power band,,,,then you are not saving any gas,,,,,
ditdater- Number of posts : 590
Location : louisville ky
Registration date : 2010-11-06
the 3;36 would get the better gas mileage of all ratios offered that yr factory ?
donivan65- Governor
- Number of posts : 12220
Location : San Diego, California
Registration date : 2008-05-12
10 bolts is usually 3:36,,,,,,,,,,there are a few 10 bolt 3:08 on the 69 and 70 vans,,,,,,12 bolts are the 3:73 and 4:11 ratios,,,,,and all gear ratios could also be the positraction types,,,,,
ditdater- Number of posts : 590
Location : louisville ky
Registration date : 2010-11-06
so if my 65 g10 rear end cover has ten bolts on cover, would that mean it has 411s in it ?
ChevyVanMan1- Number of posts : 425
Location : Your Nation's Capital
Registration date : 2009-07-19
Mine was missing a bunch of teeth so I found a 3.08 set that would fit on eBay. I wish I could remember the part number for you as it's now swiming in oil. Had a local mechanic set it up as lash and such is way to complicated for a hack like me. He had to do some machining of some assorted parts so it ended up setting me back $800 for the shop work and about $80 for the ring and pinion. Haven't run it down the highway yet but it does okay around the neighborhood. Sorry I don't have before and after RPM data to share. In other words you can put any ring and pinon ration that will fit the chunk and the carrier. Have to be a zillion of them floating around. Good luck.
donivan65- Governor
- Number of posts : 12220
Location : San Diego, California
Registration date : 2008-05-12
If it has 10 bolts on the cover, it's got the highest gear ratio in it,,,,,,on the ring gear is the gear ratio,,,,,11 divided into 37=3:36,,,,,,the 12 bolt ones are 3:73 and 4:11,,,,lots of power but they don't go very fast,,,,,and they use more gas,,,,,,the 1970 vans did have a 3:08 ratio,,,,
Guest- Guest
[b]was wondering if i could change my 1965 g 10 chevy vans rear end to get better gas mileage. dont know what my gears are but they are low. i looked all over the rear end for info but only found gm 2 on the chunk. yhis is my first 65 g 10 and i love the way it looks and drives,but the fuel it takes to operate it is lousy..any help or info would be appreciated....also am looking for side door with the glass..tnx
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