[rs91gt]

hey guys I am getting ready to install my dss306 and I have decided to put a new better trans in my car while everything is out... so should I put in the tko600 which I know nothing about except I have herd that some people have had some shifting problems with them... or should I go with a bad ass built t5 and I was thinking of using astro performance in flordia, I have herd alot of good things from them.... please help!!!!!

[thesource]

Well that really depends on what you are doing with the car . The A5 kit from Astro is a good kit and will probably fit your bill nicely . It will shifter better than a Tremec and will be about 30 lbs lighter as well . The Tremec on the other hand is stronger hands down but heavier and doesn't shift as well as a nice built T5 will . You will also need a different bellhousing and shifter along with the yoke .

[Sonic Blue 85]

What is your combo? If you have a 306 with no power adder. The T5 is definitely a better choise.The G Force and Astro T5 transmission parts will handle a lot of power and there are many options. Such as gear racios. The TKO 600 I also has a few gear racio options and can be built with multiple other options. You will have to change clutch disc with either the Astro T5 or the TKO. They both use the 26 spline chevy imput shaft. The T5s do shift better,are lighter, use less hp, but the heavier transmission will last longer with high hp and high torque. I would call Astro and G Force, tell them what your combo is, ask what options are availible. There are different gear racio options for both for 1 st through 3 rd and the over drive.Straight cut gears and helical cut gears for both transmission. The helical gears are quiet,but use more power and are not as strong as the straight cut gears. For the T5 there are multiple output shafts avalible, you can get a stronger case and tail housing. They also have bronze shift forks that are stronger than the stock forks. There are options on syconisers, you can get both with stock syncronizers with blocker rings or face tooth gears that allow you to shift extreamly fast, but are not very streetable.If you are not making more than 400 hp all you need is a well built stock T5. I use to use a T5 I modified behind a natraly asperated 500 hp 306 with no breakage problems. The only problem I had was syncros, but that was because of the speed that I was shifting the trans and the engine RPM.

[rs91gt]

Guys I am running a dss 306 shortblock with a anderson n-61 camshaft with a set of bad ass brodix st 5.0 heads ported by ron at foxlake powerproducts(great guy!!) I am running n/a and going to run around 400hp..... so I am now thinking of doing a custom built G-Force t-5 all done by Justin at JPC with the better case and everything else internal... yeah it will cost about the same as doing a tremec but I think that it will better for my set up.. my car will be more of a street car than strip.......... what do you think.........what should I do as far as the gear ratio's... I know nothing about them.........

[thesource]

Who's JPC ? I think the Astro geared T5 with a stock case and mainshaft will hold up fine in your combo .

[rs91gt]

Justin.... with the 9sec silver 05 stang..... or I was going to just order it from gforce themselves...... you really think that the astro will be enough.. I dont mind spending a little extra, just want to make sure I dont have to do it twice.............. thanks

[Sonic Blue 85]

The Asto and G Force parts are the same parts, G Force designed them. Astro was building transmissions with G Force parts later I heard they were using the same parts, but from wha I heard they were claiming they were making their own parts. I don't know who is actualy making the parts, but I know that the G Force and Astro parts are the same specs, racios and materials and both have all of the same parts. If you are only making 400 hp on motor. I would stick with a T5. If you plan on stepping up the power a G Force or Astro T5 would be better, but not needed at 400 hp. When my car was making 400 hp I found the 3.35 first gear set worked better for the track, around 500 hp the 2.95 first gear set seemed to be better. I don't remember what gear racios G Force and Asto sell. The stock first gear racios for V8's are 3.35 that was used in all 5.0s with T5s and the 2.95 that was only avalible through FRRP. If you use the 2.95 it gives you a higher overdrive racio. Then if you install a 4 cylinder overdrive if makes an even higher racio. I use to use the 2.95 first gear set with a 4 cylinder overdrive and 4.56 gears and 275/50/15 tires on the street for years and got 22 mpg. If you will find out what gear racios that are availible and list them. They should have a chart that shows what racios are availible in first through third and then the different overdrive racios when combined with the different first gears. The power goes through the first gear gears then through the overdrive gears when in overdrive. You can also go the other way, they make lower over drive racios, that do not give you much of an overdrive but make fourth and fith close enough to each other that you can excellerate quickly in 5th. Usualy used by road racers and guys running in events like the Silver State Race. Also you they have straight cut gears, straight cut gears use less power and are less prone to break. All gears try to push away from the gears they are meshed with when power is transfered through them. The more power that is applied to them the more they try to move away from each other. The farther a gear moves away from the gear it is meshed with, the more prone it is to breaking, because the the gears are meshing closer to the tips of the teeth where the teeth are thinner and weaker. The teeth on the straight cut gears have more surface area in contact with the teeth on the other gear at all times. Also helical cut gears in any transmission also force the output shaft rearward. This creates higher load on the rear bearing on the output shaft/ higher friction. I still suggest you talk to Astro and G Force to get all of the options or get on a web site. A natrally asperated 306 will not make alot of torque, as compared to a power adder engine or a 351 stroker or a big block. So if you stick to a natrally asperated 306 you will never need anyhing more than a T5. Another way to go faster and make the trasmission last longer is to use an aluminium flywheel and light weight clutch and pressure plate.

[thesource]

The G force gears are not the same as the A5 gears . I have built several of both units and they are different . As for the company cutting them , I am pretty sure the same company cuts both sets to their customers request . I would prefer the A5 kit over the G force "street gears" any day of the week .

[txlen]

Originally Posted by thesource

The G force gears are not the same as the A5 gears . I have built several of both units and they are different . As for the company cutting them , I am pretty sure the same company cuts both sets to their customers request . I would prefer the A5 kit over the G force "street gears" any day of the week .

I'd listen to Mike here...he pretty much knows what he's talkin about, heck i'd even let Mike build ya up a unit and save on the shipping and such.... opps !!...my bad...i jus looked!!...yer not local !!.... Len

[fsst93gt]

Im runnin dss331 stroker...with the tko 600, It shifts better i think than a gforce t-5, but to each is his own